To realize a panic alarm system having both an effect of repulsing a suspicious person and an effect of reducing noise pollution.

A code creation part 14 inside a transmission 1 creates a function code corresponding to a first panic and a second panic respectively by combining a lock button 11, an unlock button 12, and a panic button 13, and sends it to a receiver 2. A code receiving part 22 inside the receiver 2 identifies the function code received, and an operation selection part 24 selects whether a first alarm operation or a second alarm operation having different calmness is executed according to whether the first panic or the second panic is received.