<p>The present invention makes it easy to reduce the component costs of and assemble a slide cam in a push button switch used in a piano switch and a return spring for said slide cam. With a slide cam (33) positioned between a push button handle (34) and a spring piece (35) in a height direction (Z-direction) the spring piece (35) is affixed to the push button handle (34) thereby making the slide cam (33) the spring piece (35) and the push button handle (34) into a single unit. Each lengthwise (X-direction) end of the slide cam (33) has an angled part (33b) that contacts a reversing handle and the spring piece (35) has a rectangular opening (35a) the long direction of which is the length direction in which the angled parts (33b) of the slide cam (33) protrude towards the reversing handle. Each of two second return springs (40) is a flat spring obtained by bending one of the widthwise (Y-direction) edges (35b) of the spring piece (35) in the height direction and then bending same such that the second return springs (40) are parallel to each other at a prescribed angle with respect to the width direction. Said second return springs (40) press on lengthwise end surfaces (33c) of the slide cam (33).</p>
