Power transmission apparatus

A power transmission apparatus including a transmission, a case that accommodates the transmission, a counter drive gear to which power from the transmission is transmitted, and a counter driven gear that meshes with the counter drive gear, the power transmission apparatus comprising:

• a brake that fixes any rotational element of the transmission to the case so as not to be rotatable;
• and
• a supporting member that is fixed to the case via a fastening member and that supports the counter drive gear so as to be rotatable, wherein:
• the supporting member includes a boss portion that supports the counter drive gear so as to be rotatable, and an annular wall portion that extends outward from an end of the boss portion,
• the supporting member includes a first drum portion that functions as a brake drum of the brake, the first drum portion extends toward an opposite side of the boss portion from the annular wall portion and the first drum portion has a cylindrical shape that includes a columnar outer peripheral surface,
• the supporting member includes a second drum portion that extends toward an opposite side of the first drum portion from the annular wall portion so as to surround at least a part of the boss portion and as so as to have a same outer diameter as the columnar outer peripheral surface of the first drum portion,
• the fastening member does not interfere with the counter driven gear, and the fastening member extends outward in a radial direction from an end of the second drum portion on an opposite side of the annular wall portion, and
• the boss portion, the annular wall portion, the first drum portion, the second drum portion and the fastening member are integrally formed as a one-piece unitary structure.