Press button and portable computer using the same

A thin press button is provided. The press button includes a base plate, a link member, a cap, and at least one stopper. The link member, having a sliding recess, is disposed on the base plate. The cap pivots on the link member. The stopper has a first end and a second end, wherein the first end pivots on the cap and the second end is slidably disposed in the sliding recess.