To solve the problem that, since "over sliding" is not considered in the prior arts, a stile of a door storage panel interferes with a protruding portion that is present even after a handle is removed, and "over sliding" cannot be performed.

A sliding door device comprises: an opening/closing door 2 with which a handle 60 is provided at a door end side and which is movable in a front direction M; and at least one confronted body (a fix part 5 or a guard screen 6) which is confronted with the opening/closing door 2 when a relative position with respect to the opening/closing door 2 is changed. The handle 60 is provided in a removable manner in the opening/closing door 2 at a positioned overlapped with the confronted body in the front direction M.