An electrical connector includes a receptacle connector and a plug connector. A first fixture and a second fixture are each arranged on at least one end in the longitudinal direction of the receptacle and plug connectors, respectively. The first and second fixtures each have connection portions to be connected to a respective substrate. The first and second fixtures include at least three engaging portions and at least three anchoring portions, respectively. The engaging portions and anchoring portions are adapted to engage each other. At least one set of the engaging and anchoring portions engaged each other is caused to be in electrical continuity to use as a power supply connection. The electrical connector thus constructed is capable of sufficiently withstand any accidental external force when being fitted, and is also capable of ensuring a power supply connection without using many terminals, while keeping narrower pitches of conductors, and miniaturization and reduced overall height of the electrical connector.