To provide a linear motor actuator for which an axial member can be selected regardless of a rod where a plurality of magnets are housed and the total length can be shortened without reducing a thrust force.

A second axial member 12 is arranged in parallel with the rod 1 of a linear motor. The chip of the rod 1 and the chip of the second axial member 12 are connected by a first connecting member 11 so that the second axial member 12 moves linearly along with a linear movement of the rod 1. A second connecting member 14 connects the second axial member 12 and a housing 2 so that the second axial member 12 can move linearly to prevent the second axial member 12 from turning around the axis of the rod 1.