Linear driving device

The invention provides a linear driving device, a motor, and a method for manufacturing the linear driving device. In a linear drive device (100), a movable member (6) is driven by a guide shaft (5) and a guide screw (2) supported by a bracket (4). A nut mechanism (30), which constitutes a feed screw mechanism with a lead screw (2), is provided with a first spring (35) between two nut parts (3), so that the shake of the nut parts (3) relative to the lead screw (2) can be suppressed. Of the two nut parts (3), a first nut part (31) provided on the opposite side from the motor (1) and the first plate part (41) is not relatively movable in the direction of the axis (L) with respect to the movable member (6). Therefore, when a driven member is mounted on the movable member (6) and the movable member (6) is driven in a direction approaching the first plate portion (41), the driven member is less likely to interfere with the first plate portion (41) and members disposed around the first plate portion (41). Thus, the