An electrical connector includes a connector housing having a slot into which a circuit board is to be inserted, and a plurality of connector terminals to be inserted into the connector housing. The connector housing includes terminal spaces into which the connector terminals are inserted, and partition walls partitioning the terminal spaces from each other. The connector terminals each include a sheath to be inserted into one of the terminal spaces, and a resilient contact making electrical contact with the circuit board. The electrical connector includes a convex portion and a concave portion for preventing the terminal spaces and the circuit board from falling apart from each other. The convex portions can be formed on opposite sidewalls of the sheath, and the concave portions can be formed at the partition walls.