I found this site by a Japanese immigration lawyer
JAPAN : visa, immigration, working visa, spouse visa
Quote:
Your working visa is valid until it expires, even if you change your job. Your former employer can not take your visa away, and you can work at a new place under the visa you obtained with your former employer, if the type of activities remains the same.
If it changes however (for example from English teacher to an IT engineer), the category of your visa will no longer be appropriate, so you will need to change your visa (status of residence) as well.
In any case, it is highly recommended to apply for the Certificate of Authorized Employment when you change your job. This procedure will allow you to check with the Immigration office whether your new job enters within the type of activities that you are allowed to engage in under your current work visa. This procedure will avoid any problem at the time of your visa extension and will make it easier.
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