PURPOSE: To provide a biaxially drawn blow-molded container, an uneven part provided on the body of which is not greatly deformed to a degree to cause the reduction of strength, even when a hot filling is performed.

CONSTITUTION: A plurality of recessed parts 12 which extend in the longitudinal direction are formed while being arranged in the peripheral direction, at least from the central part to the lower part of a body part 8 of a container 1. The bottom surface part of each recessed part 12 has three panel parts such as an upper panel part 12a, central panel part 12b and lower panel part 12c. For the present biaxially drawn block-molded container, the central panel part 12b is more recessed than the other panel parts. Preferably, the center of the central panel part 12b has a shape which is slightly curved outward, and the panel structure absorbs the pressure reduction at the time of pressure reduction of the inside of the container 1 by recessing the curved center of the central panel part 12b.