A linear motor comprising: a field part that includes a field yoke extending in a motor driving direction, and a plurality of permanent magnets (22,23) which are disposed at predetermined intervals along said motor driving direction on said field yoke, and of which polarities are alternately different; and an armature that includes a plurality of pole teeth disposed via a predetermined space from the permanent magnets (22, 23) of the field part and disposed in order in said motor driving direction, and a driving coil provided at said pole teeth; said pole teeth is formed of a yoke portion positioned on the back side of a face opposite to said field part and being in contact with said adjacent pole teeth, and a tooth portion formed to protrude from said yoke portion to the side opposite to said field part; and said pole teeth includes a first pole tooth and a second pole tooth disposed adjacent to said first pole tooth; only the first pole tooth is wound with the driving coil; an engaging portion is provided at an end face on both sides at the yoke portion of said first pole tooth, and a joint portion to be engaged with said engaging portion is provided at an end face on both sides at the yoke portion of said second pole tooth; said first pole tooth includes a pair of a first core member and a second core member respectively having a yoke portion (331a, 331b) of different heights, and a tooth portion (341a, 341b) of the same height, wherein each yoke (331a, 331b) of the core member (311a, 311b) which has the greater yoke height, is provided with a hole there-through, and said first and second core members (311a, 311b) are laminated so that respective tooth portions (341a, 341b) are aligned and said laminated first and second core members (311a, 311b) are connected in said lamination direction; and said first and second pole teeth (311, 312) are disposed in order along said motor driving direction and secured onto a fixing member by means of a screw passing through the hole or a mold filling the hole, while engaging the engaging portion of said first pole tooth with the joint portion of said second pole tooth. a field part that includes a field yoke extending in a motor driving direction, and a plurality of permanent magnets (22,23) which are disposed at predetermined intervals along said motor driving direction on said field yoke, and of which polarities are alternately different; and an armature that includes a plurality of pole teeth disposed via a predetermined space from the permanent magnets (22, 23) of the field part and disposed in order in said motor driving direction, and a driving coil provided at said pole teeth; said pole teeth is formed of a yoke portion positioned on the back side of a face opposite to said field part and being in contact with said adjacent pole teeth, and a tooth portion formed to protrude from said yoke portion to the side opposite to said field part; and said pole teeth includes a first pole tooth and a second pole tooth disposed adjacent to said first pole tooth; only the first pole tooth is wound with the driving coil; an engaging portion is provided at an end face on both sides at the yoke portion of said first pole tooth, and a joint portion to be engaged with said engaging portion is provided at an end face on both sides at the yoke portion of said second pole tooth; said first pole tooth includes a pair of a first core member and a second core member respectively having a yoke portion (331a, 331b) of different heights, and a tooth portion (341a, 341b) of the same height, wherein each yoke (331a, 331b) of the core member (311a, 311b) which has the greater yoke height, is provided with a hole there-through, and said first and second core members (311a, 311b) are laminated so that respective tooth portions (341a, 341b) are aligned and said laminated first and second core members (311a, 311b) are connected in said lamination direction; and said first and second pole teeth (311, 312) are disposed in order along said motor driving direction and secured onto a fixing member by means of a screw passing through the hole or a mold filling the hole, while engaging the engaging portion of said first pole tooth with the joint portion of said second pole tooth.