To assemble easily a linear motor as a whole with high strength and accuracy.

A shaft linear motor is provided with a shaftshaped field magnet 1 and with an armature coil 21, which is composed of a plurality of ring-shaped coils Lc (Lu1, Lv1, Lw1, Lu2, Lv2, Lw2) through which the field magnet 1 is passed and which are arranged sequentially put in a row, and the armature coil 21 is used as a moving element. In this case, an outer-circumference protective member 221 which is installed for maintaining the regular state of the respective ring-shaped coils and the regular arrangement relation of the respective adjacent sing-shaped coils is provided over the plurality of ring-shaped coils Lc, constituting the armature coil 21 on the outer circumferential face of the armature coil 21.