Upvote:5
If your laptop is for personal or work use then, yes, you can bring it to Japan.
If you plan on selling the laptop, that would be a separate question.
Please note that you will likely need a plug adapter (not the same as a voltage converter) to charge your laptop in Japan. Japan delivers 100V electricity with a non-grounded U.S. style plug. More information here.
Your laptop's AC adapter will probably accept 100V electricity but you should read the label to confirm.