A linear motor comprising: a stator (2, 3) as a primary side magnetic field generating member having a coil; a movable element as a secondary side member disposed at a position opposing to the stator (2, 3) via a prescribed gap and capable of moving in a linear direction relative to the stator (2, 3); and a guide rail provided near the stator (2, 3) and capable of guiding the movable element in a movement direction wherein the stator (2, 3) includes a plurality of first magnetic pole teeth (22, 32) capable of forming a magnetic field and disposed at a prescribed pitch along the movement direction of the movable element, the movable element has a thickness direction corresponding to an opposing direction to the stator (2, 3) and a perpendicular direction to the movement direction, and includes a plurality of second magnetic pole teeth disposed at a prescribed pitch along the movement direction capable of forming a magnetic field and a nonmagnetic reinforcing part that enhances rigidity of a nonmagnetic holder holding the second magnetic pole teeth, the reinforcing part is structured by a nonmagnetic case capable of storing the holder and enhancing rigidity of the holder, the case includes a stator opposing surface (43a, 43b) disposed at a position nearer to the stator (2, 3) in the thickness direction than at least a surface of the second magnetic pole teeth, and a covering surface (43d, 43e) in the front-back relationship with the stator opposing surface (43a, 43b) in the thickness direction covers the surface of the second magnetic pole teeth opposing to the stator (2, 3) directly contacted with, the case further including a plurality of guided part attaching surfaces to which a plurality of guided parts guided by the guide rail is attached, and at least the stator opposing surface (43a, 43b) is smoothly formed and the stator opposing surface (43a, 43b) is in parallel to a surface of the first magnetic pole teeth (22, 32), the surface of the first magnetic pole teeth (22, 32) opposing to the movable element, the guided part attaching surfaces are parallel to the stator opposing surfaces (43a and 43b) or on an identical plane, and perpendicular to the opposing direction of the stator (2, 3), the guided part attaching surfaces are arranged perpendicular to the opposing direction of the movable element and the stator, the guided parts and the guided part attaching surfaces are arranged perpendicular to the movement direction of the movable element. a stator (2, 3) as a primary side magnetic field generating member having a coil; a movable element as a secondary side member disposed at a position opposing to the stator (2, 3) via a prescribed gap and capable of moving in a linear direction relative to the stator (2, 3); and a guide rail provided near the stator (2, 3) and capable of guiding the movable element in a movement direction wherein the stator (2, 3) includes a plurality of first magnetic pole teeth (22, 32) capable of forming a magnetic field and disposed at a prescribed pitch along the movement direction of the movable element, the movable element has a thickness direction corresponding to an opposing direction to the stator (2, 3) and a perpendicular direction to the movement direction, and includes a plurality of second magnetic pole teeth disposed at a prescribed pitch along the movement direction capable of forming a magnetic field and a nonmagnetic reinforcing part that enhances rigidity of a nonmagnetic holder holding the second magnetic pole teeth, the reinforcing part is structured by a nonmagnetic case capable of storing the holder and enhancing rigidity of the holder, the case includes a stator opposing surface (43a, 43b) disposed at a position nearer to the stator (2, 3) in the thickness direction than at least a surface of the second magnetic pole teeth, and a covering surface (43d, 43e) in the front-back relationship with the stator opposing surface (43a, 43b) in the thickness direction covers the surface of the second magnetic pole teeth opposing to the stator (2, 3) directly contacted with, the case further including a plurality of guided part attaching surfaces to which a plurality of guided parts guided by the guide rail is attached, and at least the stator opposing surface (43a, 43b) is smoothly formed and the stator opposing surface (43a, 43b) is in parallel to a surface of the first magnetic pole teeth (22, 32), the surface of the first magnetic pole teeth (22, 32) opposing to the movable element, the guided part attaching surfaces are parallel to the stator opposing surfaces (43a and 43b) or on an identical plane, and perpendicular to the opposing direction of the stator (2, 3), the guided part attaching surfaces are arranged perpendicular to the opposing direction of the movable element and the stator, the guided parts and the guided part attaching surfaces are arranged perpendicular to the movement direction of the movable element.