How to specify key in SSHFS?

I've got a question that I've not been able to find an answer for. I have two computers, both of which run Ubuntu Linux 12.04. I have set up my first computer ("home") to be able to SSH into my second computer ("remote") using public/private RSA key authentication. This is not the first SSH connection that have set up using key authentication on my home computer, so my home computer has several id

[extendskick]

秘密鍵のオプション “sshfs me@x.x.x.x:/remote/path /local/path/ -o IdentityFile=/path/to/key”