To provide a sucker device advantageous to install it in a narrow place, without requiring to largely secure a space for rocking a lock lever.

A sucking surface 24 is faced to a sucking object surface 2, and a central shaft 14 is pressed to the sucking object surface 2, and the whole area of the sucking surface 24 is contacted with the sucking object surface 2. When the tip of a skirt part 32 is allowed to abut on an outer peripheral part of a back face 26 or a place of the sucking object surface 2 on the outside in the radial direction of the back face 26, an initial sucking state is formed. When rotating the lock lever 18 to a rock position from an initial position from this initial sucking state, the central shaft 14 is forcibly displaced in the direction for separating from the sucking object surface 2 by a cam mechanism 22, and the final sucking state is formed.