To provide buried structure in which unequal sinking of pipes is prevented when a synthetic resin pipe for protecting a plurality of communication cables and the like are buried.

A covered synthetic resin pipe of rectangular section is formed so that divided blocks 3a, 3b made of styrene foam are provided on the circumference of a synthetic resin pipe 2, and they are continuously arranged in the vertical direction and the horizontal direction. At least the both end parts of the upper face and the both end parts on the lower face are provided with reinforcing angles 4, The parts are bound, and by forming the whole body into a rectagular shape, a compassion work is made easy and the synthetic resin pipes 2 can be prevented from being deformed.