How to type the BACKSLASH character - "\" with a Japanese Keyboard?

Hello Everyone,

I bought my MacBook here in Japan so I have the Japanese Keyboard. I need to know how to type the BACKSLASH "\" character. What I'm doing right now is that I just copy-paste the backslash character to my programs. It's a little tedious and so not efficient so I hope you guys can help me. Thank you in advance!

Regards,