A method for increasing the number or weight of seeds or fruits of a crop, said method comprising treating the crop with effective amounts of a compound represented by formula (1) and at least one kind of a compound selected from group (A). Thus, a method for increasing the number or weight of seeds or fruits of a crop can be provided.Formula (1)Group (A): a group consisting of Tebuconazole, Prothioconazole, Cyproconazole, Metconazole, Boscalid, Fluopyram, Fluxapyroxad, Azoxystrobin, Dimoxystrobin, Pyraclostrobin, Trifloxystrobin and Picoxystrobin.