To provide a manifold cylinder to reduce a pitch between the piston rods of cylinders without requiring miniaturization of a cylinder itself more than necessary when a plurality of cylinders are arranged in parallel.

In this manifold cylinder, a plurality of cylinders 10 are arranged in parallel in a row on the cylinder placing surface 6 of a base 1 formed in a long state. Mounting holes 2 are formed in the both end parts in a longitudinal direction of the base 1 and by inserting a bolt in the mounting hole 2 the base 1 is threadedly engaged fixed at one time togetherwith the cylinders 10. This constitution eliminates a need to provide a means to fix each of the cylinders in a given position, and each cylinder 10 can be arranged with an extremely short clearance, or can be arranged almost contacting with each other. Pitch P1 between piston rod 17 can be reduced without reducing the width D1 of the cylinder 10.