Called FUTOMAKI MAKKI by BANDAI. You can buy some at Strapya World!
It's all in japanese but not hard to understand thanks to the drawing, and really easy to use (after 1 or 2 try though... you need to get used to it first)
Here's the result:
wrong so it's totally disconnected with the ears. BUT it turned out better than making it by hand!
Here I tried heart shaped and flower with the maker. Now compare with the "by hands" and see the difference (^.^)