To provide a canned linear motor being lightened/increasing its rigidity more than conventional devices while maintaining the performance of a conventional linear motor regarding an armature size, the temperature rises of the surface of the linear motor and an armature winding, a reliability on an insulation and a viscous braking force.

A canned linear-motor armature includes: the armature winding 108 consisting of a coil formed in a plate shape; and a ceramic box body 101 being formed so as to surround the armature winding 108 in a frame shape and having no female tapped-hole machining, embedding of a metallic bush or the like. The canned linear-motor armature further includes a can 102 made of a carbon-fiber reinforced resin hermetically sealing the opening of the box body 101 and forming a plurality of refrigerant flow paths 110 on the inside.