To provide a trunnion suspension to reduce weight as corrosion is prevented from occurring.

A trunnion suspension comprises a leaf spring 4; a spring seat 6 having a seat part to support the leaf spring 4; a trunnion bracket 8 provided with a seat against a car body frame; and a trunnion shaft 7 fitted in shaft holes formed in the spring seat 6 and the trunnion bracket 8. The spring seat 6 and/or the trunnion bracket 8 is molded by using aluminum or an aluminum alloy material. A collar made of iron is fitted in the shaft hole of the spring seat 6 and/or the trunnion bracket 8.