An electrical connector with a locking mechanism includes a housing and a locking mechanism provided in the housing. The locking mechanism includes a first support portion extending from the housing, a lock main body supported by the first support portion in a swingable manner, an engagement tab capable of engaging with and disengaging from an engagement portion provided in a counterpart electrical connector according to swinging of the lock main body, and an operating portion arranged to be pressed in order to swing the lock main body. The operating portion includes a second support portion provided in the lock main body and an operating portion main body supported by the lock main body via the second support portion. A space for allowing the operating portion main body to bend is formed between the operating portion main body and the lock main body.