Updated: 2026.03.16

Reasons why your suitcase password lock won't open and how to open it

Title

Semirow Japan Inc.'s travel brand, "New Trip," is launching a "Lock Opening Guide" to quickly resolve unexpected issues that arise during travel and support safe journeys. There are various reasons why a suitcase might not open, such as forgetting the dial combination or accidentally changing settings.

For the 2026 travel season, we propose solutions to minimize the panic of being unable to retrieve essential luggage and to enable everyone to calmly resume their travels.

table of contents

1. [First, check] 3 things to check before demolition

2. Three Main Causes of Lock Failure

3. [Complete Guide] How to Open a Suitcase (by Type)

4. What if the problem still cannot be solved?

summary

FAQ: Frequently Asked Questions about Locks

一、スーツケースのロックが開かない時の3つの確認ポイント

Before proceeding with unlocking the device, let's confirm there are no structural misunderstandings.

This alone often resolves the issue.

ダイヤル番号をもう一度確認する

Many users contact us saying, "There's no key," but the keyhole on a TSA lock (Transportation Security Administration-approved lock) is for airport inspectors to open with a special master key. You do not need to look for a key because it is designed for customers to manage it only with the dial combination.

ジッパーがロック部分に挟まっていないか確認

When you purchase a new one, or when settings you thought you'd reconfigured aren't reflected correctly, it often opens at the default "0-0-0." Please try setting it exactly to "0-0-0" and then operating the button.

TSAロックの鍵穴について

Even if the lock itself is disengaged, you may mistakenly believe that it "won't open" because the inner fabric is deeply caught in the zipper. In this case, pulling hard will damage the zipper. The engineer-recommended solution is to carefully push the fabric back with tweezers or similar tools through the gap.
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For more information on how to use TSA locks, please see this article:

Related article: How Zipper-Type TSA Locks Work and How to Use Them Correctly | What to Watch Out For When They Won't Open

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二、スーツケースのパスワードロックが開かなくなる主な原因

Understanding the physical reasons why a lock might stop working helps us determine the correct solution.

番号を忘れた・設定番号が違う

This is the most common cause.

Especially with the "press the set button while turning the dial" type, there are cases where the button is unintentionally touched and a different number is overwritten (mistake in setting).

移動中の振動でダイヤル位置がずれた

Vibrations of the caster may cause the internal discs to shift by a fraction of a millimeter. Also, "salt biting" from use at the beach, or sand and dust entering the dial can cause the internal parts to misalign, even with the correct number.

荷物の入れすぎでケースが歪んだ

When the luggage is packed to its maximum capacity, a strong pressure is applied to the latch (receiver) of the lock from the inside.

This pressure can prevent the lock release spring from engaging even when the correct combination is entered.
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三、ロックの種類別｜スーツケースが開かない時の対処方法

If the lock won't open, first check the type of suitcase you have.
The opening method differs greatly depending on the type.

Here, we will introduce safe opening methods for three common types.
For all methods, the key is to try slowly without forcing it.

ファスナー式スーツケースの場合

For zipper types, there is an emergency fix that allows you to open it without using a key .
However, this method should only be used as a last resort, as it may damage your suitcase.

procedure:
1. Move the zipper slider (pull tab) to the edge
2. Insert the tip of a ballpoint pen or similar into the center of the zipper
3. Open the zipper with your fingers while gently pushing it in.
4. Once opened, remove your belongings and move the slider to the other side.

Although the zipper appears to be closed, it can be returned to its original position by sliding the zipper part .
However, be careful not to do this repeatedly as it may cause damage.

💡 ポイント：

  • この方法は「鍵を解錠する」のではなく、「チャック部分を一時的に開く」だけです。
  • 旅行中の緊急対応としてのみ活用してください。

ダイヤルロックの場合

A combination lock is opened by entering a number combination .
If you have forgotten the number or it is out of sync and you can't open it, try the following steps:

procedure:
1. First, try setting it to "000" or "0000"
2. If it doesn't open, look for the small groove underneath the number
3. Slowly turn each dial to find the position where the grooves line up.
4. Once all the grooves are aligned, try pressing the unlock lever.

If it doesn't open, try again, changing the numbers slightly.
If it's three digits, there are a maximum of 1,000 possibilities, but if you keep trying patiently you can often get it to open.

💡 ポイント：

  • 強くレバーを押したり、無理に回すのはNG。内部ギアを傷めると修理が必要になります。

鍵タイプの場合

The keyhole has a slightly unusual structure.
If it doesn't open even after aligning the numbers, it's possible that the numbers shifted after inspection.

 

Procedure:
1. Check the part with the keyhole and return the numbers to the initial value "000"
2. If it still doesn't open, try gently pushing the pins inside the keyhole with tweezers or a hairpin
3. Move it gently as if turning it, without applying force

 

This method is a bit delicate.
If you are not used to it, it is safer to consult the manufacturer or a key specialist.

💡 ポイント：

  • 鍵穴の内部には細かいピンがあり、無理な操作で破損する恐れがあります。
  • 素人判断で分解したり、針金を無理に差し込むのは避けましょう。
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Related video: "What to do when you forget the password for your suitcase's TSA lock!"

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四、どうしても開かない場合の対処方法

If you've tried all self-unlocking steps and it still won't open, it might be time to seek professional assessment rather than forcing it.

  1. Take it to a "Repair Shop" at the airport.
    Major airports (Haneda, Narita, Kansai, etc.) have suitcase repair specialists on site. Professional technicians are highly likely to be able to unlock it without damaging the casing, using specialized scopes and other tools.
  2. Use a mobile locksmith service.
    If you're at a hotel or at home, you can call a locksmith. However, since TSA locks are special, always call beforehand to confirm if they "handle TSA lock unlocking."
  3. [Prevention] What to do immediately after unlocking
    　　Photograph the combination with your smartphone: Save the set combination as a photo, not a memo, so you don't forget it.
    　　Avoid setting in the dark: Most incorrect settings occur in dark places or when you're in a hurry. Always change settings in a bright, calm environment.

メーカーへ問い合わせる

購入したメーカーのカスタマーサポートに連絡しましょう。

型番や購入日を伝えることで、適切な対処法を案内してもらえます。

New Tripのスーツケースをご利用の方は、以下の連絡先にお問い合わせください。

New Tripカスタマーサポート：

  • メール：newtrip1021@gmail.com
  • 営業時間：9:30～19:00（月～金曜日)

修理店へ相談する

スーツケース専門の修理店では、ロック部分の修理や交換が可能な場合があります。

ただし、修理費用が高額になることもあるため、事前に見積もりを確認しましょう。

買い替えを検討する

修理費用が高額な場合や、スーツケース自体が古い場合は、買い替えを検討するのも一つの選択肢です。

次回スーツケースを選ぶときのポイント：

  • TSAロック搭載で海外旅行にも対応
  • 使いやすいダイヤル式ロック
  • 万が一の時にメーカーサポートがある

If you are considering replacing your suitcase due to a lock issue, we highly recommend the New Trip 0702 Plus. The biggest reason for this is that it is equipped with the "TSA008" lock, the latest security standard.
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まとめ

When the lock on your suitcase won't open, the important thing is to "stay calm, don't break it, and respond correctly."

Many problems, such as incorrect numbers or incorrect operation of the TSA lock, can be resolved by staying calm and following the steps.

If you are unable to open it yourself, there is reliable professional support available from manufacturers and locksmiths.

And for your next trip, choose a New Trip suitcase with a secure TSA lock.


Its functionality and reliability will make your journey more comfortable.

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FAQ：ロックに関するよくある質問

Q1. TSAロックの鍵をなくした場合は？

A1：TSAロックの鍵穴は空港職員専用のため、一般利用者は暗証番号で開けるのが基本です。
付属の鍵を紛失した場合は、メーカーに問い合わせて予備の鍵を取り寄せることができる場合があります。

Q2. 初期設定番号000で開かない場合は？

A2：購入後に誰かが番号を変更した可能性があります。
まず「000」以外に、よく使われる「111」「123」なども試してみてください。
それでも開かない場合は、メーカーに問い合わせましょう。

Q3. ダイヤル番号を忘れた場合は？

A3：自分でよく使う誕生日、記念日、電話番号の下3桁などを試してみてください。
それでも思い出せない場合は、メーカーに型番と購入証明を提示して相談しましょう。

Q4. ロックを壊して開けてもいい？

A4：緊急時には仕方ありませんが、以下の点に注意してください。
ロックを壊すと修理が難しくなり、ファスナー式の場合は破損する恐れがあります。
可能であれば、まずメーカーに問い合わせることをおすすめします。

Q5. スーツケースの鍵は必要？

A5：海外旅行ではTSAロック付きスーツケースが推奨されます。
国内旅行では必須ではありませんが、貴重品を入れる場合はロック付きの方が安心です。

Q6. New Tripのスーツケースはどこで修理できますか？

A6：New Tripカスタマーサポート（support@newtrip.jp）にお問い合わせください。
型番と購入日をお伝えいただくと、修理対応や交換部品のご案内ができます。

執筆・監修

New Trip編集部
本記事は、スーツケース・旅行用品ブランド「New Trip」の編集部により制作されました。
製品開発やユーザーの声を活かしながら、ユーザーに合ったスーツケースや、旅行・出張をより快適にするアイテムを発信しています。

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