The present study explored the effects of cooperative or competitive situations, sex differences, and the cultural differences between Japan and China on the allocation choices of a reward, and the effects of these variables on interpersonal attraction for allocators. Eighty male and fourty female undergraduate students in both countries answered the question which asked the subjects' own allocation choices and the liking for allocators, after they read the description of a game situation. The game was either group or individual task, and the allocators chose either equal or equitable allocation. The results suggested that there were differences between both countries in the subjects' own allocation choices, while there were similar tendencies between them in the liking for allocators. In both, interpersonal attraction is affected by both altruism and fairness of the allocators, and fairness judgment is affected mainly by allocation similarity.
