POWER TRANSMISSION DEVICE

Provided is a power transmission device that has a simple structure and suppresses magnetic field leakage from a power transmission coil while suppressing excessive increase in the outer shape and the weight of the power transmission device. A power transmission device includes: a power transmission portion including a power transmission coil and a housing made of metal and having a peripheral wall surrounding the power transmission portion . A shielding portion protruding inward of the peripheral wall is integrated with, of the peripheral wall , a top end located on a power reception coil placement side.