Ignition device

An ignition device, comprising:

• a resin case having an opening;
• a core made of magnetic material, and having a columnar portion, of which one end projects from the opening, and of which other end penetrates and projects from a bottom wall of the resin case opposite to the opening;
• a coil bobbin which the columnar portion penetrates, and arranged in an interior of the resin case;
• an ignition coil wound around the coil bobbin;
• a retainer of which a ring portion and a plurality of leg portions extending from the ring portion are integrally molded with resin, the ring portion defining an opening that is complementary in shape to the periphery of columnar portion;
• and
• a filling resin with which the resin case is filled,
• wherein the ring portion is arranged in an end of the coil bobbin at the opening side, while the columnar portion extends through the opening of the ring portion,
• wherein the plurality of leg portions extends in between an inner face of a through hole of the coil bobbin and an outer peripheral face of the columnar portion toward the bottom wall along the columnar portion, and
• wherein the resin case is filled with the filling resin in a manner that at least a part of the ring portion opposite to the plurality of leg portions is exposed.