An ignition coil for an internal combustion engine, provided with a primary coil, a secondary coil, a bobbin, a center core and a mold resin member. The primary coil and secondary coil are magnetically connected to each other. The primary coil is directly wound on the bobbin. The center core is disposed in close contact with the bobbin at an inner space thereof. The mold resin member has the primary coil, the secondary coil, the bobbin, and the center core embedded at the inner side thereof. The bobbin includes thermoplastic resin and dispersed phase particles which are dispersed in the thermoplastic resin. The dispersed phase particles being lower in elasticity than the thermoplastic resin.