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Provided is a rare earth metal complex including a rare earth metal atom and a ²-diketone compound coordinated to the rare earth metal atom, the ²-diketone compound being represented by the following Formula (1). In Formula (1), R 1 represents a hydrogen atom, a halogen atom, an alkyl group, a perfluoroalkyl group, an alkoxy group, a perfuoroalkoxy group, a nitro group, an amino group, a sulfonyl group, a cyano group, a silyl group, a phosphone group, a diazo group, a mercapto group, an aryl group, an aralkyl group, an aryloxy group, an aryloxycarbonyl group, an allyl group, an acyl group, or an acyloxy group.