Vehicle support structure and method for manufacturing vehicle support structure

A method for manufacturing a vehicle support structure, the vehicle support structure including a main body portion that axially supports an axle rotatably and a vehicle part attachment portion that extends from the main body portion, in which the vehicle part attachment portion includes a first boss portion, a second boss portion, and a third boss portion that are placed in a triangular form when viewed from a direction along the axle, a first connection portion that connects the first boss portion with the third boss portion, and a second connection portion that connects the second boss portion with the third boss portion, the method for manufacturing a vehicle support structure comprising:

• starting pouring molten metal of aluminum or an aluminum alloy into a molding mold, with a sprue at a lateral position and the main body portion in a horizontal state;
• and
• thereafter performing casting after the pouring of the molten metal is completed while the molding mold is tilted such that the sprue is located at an upper position,
• the molding mold having a cavity corresponding to each of the first connection portion and the second connection portion so as to be gradually tilted in such a manner that center portions thereof in a longitudinal direction are reduced in thickness, and the sprue provided at a position corresponding to a side portion of the third boss portion on an opposite main body portion side.