Abstract: A roller skate is disclosed, in which two wheels are provided, and width can be freely adjusted, and the wheels can be detachably attached to a rear side of a shoe with a band, and the wheels are moved down when used, and the wheels are moved up when not used by allowing the wheels to rotate up and down. So, when not used, the user can walk like the shoes are worn in real. The movement and wearing are easy, and the size can be freely adjusted, and it is very easy to start, run and stop.

Abstract: roller skate that is easy to attach and detach in accordance to this invention can be used by adjusting its size according to the size of user's shoes. Moreover, it can be carried around easily due to its small size. Control is facilitated since wheel exists only at the back axis. Men and women, and old and young can use it easily, and there shall be various effects such as its ability to prevent safety related accident.