To provide a conveyance container that is prevented from slipping and falling caused by vibration or an impact during conveyance, and can be stably positioned and held by a holding arm.

An upper flange 4 and a lower flange 5 projecting outward are formed at upper and lower parts of at least two opposite side walls of the approximately rectangular parallelepipedic container. The lower face of the upper flange and the upper face of the lower flange have forms of inclined projections and recesses. Projections and recesses which fit to the inclined projections and recesses with play are formed on upper and lower faces of the holding arm 10 that has a U-shape as viewed from above.