The electric reel for fishing includes a spool rotatably supported between the side plates of a reel body and a driving motor arranged on the reel body for driving and rotating the spool. A concave part is formed on the reel body, an armature is rotatably arranged inside the concave part and a magnet constituting a magnetic field is mounted on the inner surface of the concave part opposed to the armature to constitute a driving motor for driving and rotating the spool.