A base frame includes a top surface member formed from a plate-shaped material, a bottom surface member formed from a plate-shaped material and disposed in parallel to the top surface member, and a reinforcing member disposed between the top surface member and the bottom surface member. The reinforcing member is formed from a plate-shaped material, and includes a main body portion having a flat plate shape and intersecting the top surface member and the bottom surface member. The main body portion includes a first contact portion in contact with the bottom surface member and a second contact portion in contact with the top surface member.