An electrical connector comprising: a connector case including a connector fitting portion configured to fit to a power receiving connector and accommodating an electric wire; a power feeding terminal provided in the connector fitting portion and connected to the electric wire, the power feeding terminal being configured to be connected to a power receiving terminal of the power receiving connector in a fitting state where the power receiving connector and the connector fitting portion are fitted together; a lock mechanism configured to prevent the power receiving connector and the connector fitting portion from being separated from each other in the fitting state between the power receiving connector and the connector fitting portion; a fitting detecting mechanism configured to detect the fitting state between the power receiving connector and the connector fitting portion; and a lock release unit including an operating portion advanceable from and retreatable to the connector case, and a latch portion configured to latch to a portion of the lock mechanism and a portion of the fitting detecting mechanism with the operating portion being retreated to the connector case, wherein, upon release of the latching of the latch portion in the fitting state between the power receiving connector and the connector fitting portion, the operating portion of the lock release unit is configured to move in a direction where the operating portion advances from the connector case and become operatable to enable release of the fitting state between the power receiving connector and the connector fitting portion, wherein the lock mechanism includes a lock arm swingably provided in the connector case, a lock claw provided at one end of the lock arm at a side of the power receiving connector and being protrudable and retractable from the connector fitting portion, and a lock piece provided at the other end of the lock arm and being latchable to the latch portion of the lock release unit, wherein the fitting detecting mechanism includes a latch arm swingably provided in the connector case, a latch claw provided at one end of the latch arm at a side of the power receiving connector and being protrudable and retractable from the connector fitting portion, and a latch piece provided at the other end of the latch arm and being latchable to the latch portion of the lock release unit, and wherein the latch claw is provided at a nearer side than the lock claw in a fitting direction where the connector fitting portion is fitted to the power receiving connector and is provided with the lock claw along the fitting direction. a connector case including a connector fitting portion configured to fit to a power receiving connector and accommodating an electric wire; a power feeding terminal provided in the connector fitting portion and connected to the electric wire, the power feeding terminal being configured to be connected to a power receiving terminal of the power receiving connector in a fitting state where the power receiving connector and the connector fitting portion are fitted together; a lock mechanism configured to prevent the power receiving connector and the connector fitting portion from being separated from each other in the fitting state between the power receiving connector and the connector fitting portion; a fitting detecting mechanism configured to detect the fitting state between the power receiving connector and the connector fitting portion; and a lock release unit including an operating portion advanceable from and retreatable to the connector case, and a latch portion configured to latch to a portion of the lock mechanism and a portion of the fitting detecting mechanism with the operating portion being retreated to the connector case, wherein, upon release of the latching of the latch portion in the fitting state between the power receiving connector and the connector fitting portion, the operating portion of the lock release unit is configured to move in a direction where the operating portion advances from the connector case and become operatable to enable release of the fitting state between the power receiving connector and the connector fitting portion, wherein the lock mechanism includes a lock arm swingably provided in the connector case, a lock claw provided at one end of the lock arm at a side of the power receiving connector and being protrudable and retractable from the connector fitting portion, and a lock piece provided at the other end of the lock arm and being latchable to the latch portion of the lock release unit, wherein the fitting detecting mechanism includes a latch arm swingably provided in the connector case, a latch claw provided at one end of the latch arm at a side of the power receiving connector and being protrudable and retractable from the connector fitting portion, and a latch piece provided at the other end of the latch arm and being latchable to the latch portion of the lock release unit, and wherein the latch claw is provided at a nearer side than the lock claw in a fitting direction where the connector fitting portion is fitted to the power receiving connector and is provided with the lock claw along the fitting direction.