To provide an electrical connection device 10 which reduces the assembling manhour needed for a fixing a coil 3 and for electrical connection of the coil by improving invention in the electrical connection structure of the ignition coil 3, used as an electrical device, with an external electrical connection part 8.

An electrical connection device is provided with a conductive terminal 7, which is provided in such a way as to protrude the outside of a connector housing 6 and is formed the projected point part 7a in a needle shape, and an external electrical connection part 8 having a covering member 8a, which is fixed in the upper part of a head cover 2 in the vicinity of a site mounted with an ignition coil 3 as a prescribed surface site and consists of a flexible material having an electrical insulation property, and a conductive member 8b buried in this member 8a. At the same time when the coil 3 is mounted to a hole part 5 for mounting and is fixed on the hole 5, the point part 7a of the terminal 7 penetrates the member 8a and is fitted in the member 8a and the terminal 7, os that the member 8a are electrically connected with each other.