Windmill and wind power generation apparatus

A windmill comprising a shaft, a blade, and a supporting member, wherein

• the windmill is rotatable about a center axis of the shaft,
• the blade has a blade main body portion extending along an axial direction of the center axis,
• in a cross-sectional view orthogonal to the axial direction, the blade main body portion includes a front edge and a rear edge, the front edge being disposed at a leading end of the blade main body portion in a rotation direction of the windmill, the rear edge being disposed at a trailing end of the blade main body portion in the rotation direction,
• the supporting member extends along a radial direction orthogonal to the axial direction and passing through the center axis, so as to connect the shaft and the blade main body portion to each other,
• the supporting member has a front end and a rear end, the front end being disposed at a leading end of the supporting member in the rotation direction, the rear end being disposed at a trailing end of the supporting member in the rotation direction,
• a straight line passes through an intermediate position between the front end and the rear end of the supporting member and is parallel to the radial direction,
• a blade chord line connects the front edge and the rear edge of the blade main body portion, with a midpoint being located equidistant from the front edge and the rear edge of the blade main body portion,
• the straight line intersects the blade chord line at a position closer to the rear edge of the blade main body portion than the midpoint of the blade chord line, and
• the rear end of the supporting member meets the blade main body portion at a position on the blade main body portion that is offset from the rear edge of the blade main body portion in a direction along the blade chord line.