LINEAR MOTION/ROTATION DRIVE DEVICE

Provided is a linear motion/rotation drive device with which inertia caused by a magnetic scale attached to an output shaft when linearly moving or rotating the output shaft can be suppressed. The linear motion/rotation drive device (1) has an output shaft (2), a linear motor part (3), a rotary motor part (4), a ball spline bearing (5), a magnetic scale (8), a first magnetic detection element (41)for detecting linear motion, and a second magnetic detection element (42) for detecting rotation. The magnetic scale (8) is provided with a grid-shaped magnetization pattern (37) wherein S-poles andN-poles are arranged alternately in an axial (L) direction on a circumferential surface around an axis (L), and the S-poles and N-poles are magnetized alternately around the axis (L). The first magnetic detection element (41) and the second magnetic detection element (42) are disposed facing the magnetization pattern (37). Since a linear motion position and rotation position can be detected by means of the first magnetic d