Ignition coil

An ignition coil comprising:

• a primary coil and a secondary coil magnetically coupled with each other;
• a center core disposed at inner peripheral side of the primary coil and the secondary coil with respect to a coil axial direction;
• a magnet body disposed at one side of the center core in the coil axial direction;
• and
• an outer peripheral core provided with a first opposite side, a second opposite side and a coupling side, the first opposite side facing the magnet body from an opposite side of the center core, the second opposite side facing the center core from the opposite side of the magnet body, the coupling side coupling the first opposite side with the second opposite side,
• wherein
• the center core has a magnet side flange portion disposed at an end portion in a magnet body side, protruding in a protrusion direction orthogonal to the coil axial direction;
• and
• a thick portion is formed at at least a part of the first opposite side which overlaps the magnet side flange portion in the coil axial direction and at least a part of the coupling side which overlaps at least either the magnet side flange portion or the magnet body in the protrusion direction, a thickness of the thick portion being larger than a minimum thickness of the second opposite side.