A composite material structure is provided a metal member and a resin member. The metal member is formed in a planar shape that has a main surface. The resin member is bonded to the main surface of the metal member. The metal member has a thermal expansion coefficient in a first direction along the main surface is larger than a thermal expansion coefficient in a second direction along the main surface. The second direction is orthogonal to the first direction. The resin member is formed of a fiber-reinforced resin having a fiber quantity in the second direction that is larger than a fiber quantity in the first direction.