To provide a method of correctly measuring the photoelectric transfer characteristics in standard conditions of a group of a multi-junction solar cell, having variations in relative spectral sensitivity of element cells which is manufactured in a production line.

The method of measuring the characteristics of a multi-junction photoelectric conversion element performs the lamination of the plurality of element cells and measures the characteristics of the multi-junction photoelectric conversion element testing cell measured under the approximate sunlight optical source. The method of measuring the characteristics of the multi-junction photoelectric conversion element includes a step of acquiring reference characteristics which are the characteristics under the standard conditions of the reference cells of a plurality of configurations equivalent to the testing cell, a step of setting the conditions of an approximate sunlight optical source so that the reference characteristics of the plurality of reference cells are acquired, and a step of measuring the output characteristics of the testing cell under the approximate sunlight optical source after the conditioning is set.

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