The invention relates to a linear motor equipped with a field element and an armature and adapted to produce a force causing the field element and the armature to be relatively displaced along a given axial direction by interaction of magnetic fluxes generated between the field element and the armature during an operation of supplying electric power to the armature. In one typical aspect of the invention, the linear motor is provided with: a stator which is formed as one of the field element and the armature; a mover which is formed as the other of the field element and the armature; a frame member which defines the axial direction; a rail which is adapted to guide the mover allowing only to reciprocate in a linear direction; a first positioning portion which is provided on the frame member to set a fixing position of the stator with respect to the frame member; and a second positioning portion which is provided on the frame member to set a fixing position of the rail with respect to the frame member in such a manner as to allow the mover to reciprocate along the axial direction with a given gap formed between the mover and the stator positioned by the first positioning portion.