Calcaneal stress fracture is uncommon and it has been rerely reported in Japan. We are reporting a very rare case of bilateral calcaneal stress fractures. The patient was a 27-year-old man, who noticed pain and swelling in the region of the bilateral heels after running. Roentgenogram showed a dense line of increased bone reaction running anterior and parallrl to the posterior margin of the bilateral calcaneus, and the diagnosis of calcaneal stress fracture was suggested. The patient was placed on light duty with diminished weight bearing. After two weeks pain and swelling diminished.