To provide a vibration power generator having high power generation efficiency by extending a moving distance of a permanent magnet moving in a cylindrical case.

A vibration power generator comprises: a movable element movably disposed along an inner wall of a cylindrical member and having a plurality of permanent magnets fixed by a fastening member; a coil provided in a moving direction of the movable element along a wall of the cylindrical member; a cylindrical buffer member disposed at both ends of the cylindrical member, restricting movement of the movable element, and having a through-hole which enables intrusion of the fastening member in collision with the movable element; a deformation restricting part which restricts deformation of the through-hole in collision with the movable element; and a gap part which enables accommodating a deformed portion of the buffer member caused due to collision with the movable element.