Self-incompatibility in Camelia japonica cultivars was compared. From the self-pollination of ten cultivars, 'Hatsu-arashi', 'Kanto-hatsuwarai', 'Aki-no-yama' and 'Fukumusume' revealed the fruit set from 5.0 to 27.0%, and perfect seeds could be obtaines from 'Hatsu-arashi' and 'Fukumusume'. Self- and cross-pollination shoed similar values in percentages of perfect seeds and of germination. Two seedlings from self-pollination of 'Hatsu-arashi' were conducted for isozyme analysis, and were found to be derived from self-fertilization.