Linear motion/rotation detector

The invention provides a linear motion/rotation detector capable of inhibiting an increase in size in the linear motion direction. The linear motion/rotation detector (7) is provided with: a cylindrical magnetic scale (8) which moves linearly in the axial direction (X), and rotates around the axis (L); a first magnetic detection element (41) for detecting the linear motion position; and a second magnetic detection element (42) for detecting the rotational position. The magnetic scale (8) has, provided to the circumferential surface, a grid-like magnetization pattern (37) in which S poles and Npoles are alternately arranged in the axial direction X, and the S poles and the N poles are alternately magnetized around the axis (L). The first magnetic detection element (41) and the second magnetic detection element (42) are disposed facing the magnetization pattern (37). The linear motion position and the rotational position can be detected by the first magnetic detection element (41) and the second magnetic detect