To provide a resin foam difficult to generate deformation in a resin composite and to provide a resin composite excellent in dimensional stability.SOLUTION: When a resin composition is heated at a glass transition temperature for 1 hour, a value of the second dimensional change rate observed after 1 hour is smaller than a first dimensional change rate observed after 60 seconds, and the first dimensional change rate is 1 percent or larger and 10 percent or smaller, and the second dimensional change rate is -5 percent or larger and 5 percent or smaller.SELECTED DRAWING: Figure 1

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