Disclosed in one embodiment is an operating method of a sidelink receiving terminal in a wireless communication system, comprising the steps of: receiving a physical sidelink shared channel (PSSCH); and transmitting a physical sidelink feedback channel (PSFCH) after receiving the PSSCH, wherein the receiving terminal performs Tx/Rx switching in one part of a first symbol, which is the symbol after the last symbol in which the PSSCH is received, transmits a signal related to automatic gain control (AGC) in the remaining part of the first symbol, and transmits the PSFCH in the symbol after the first symbol.