To provide a side ditch capable of preventing deposition of sediment and dirt inside a water channel as well as a side ditch molding equipment.

A hollow water channel 2 with both ends opened in a longitudinal direction is formed, and the inner peripheral surface of the water channel 2 is sloped toward the center in the longitudinal direction of the water channel at the side surfaces at both sides and the top surface from both the ends, and the surfaces are formed to a tapered surface shape so as to make the cross section of the running water narrower for the side ditch 1. Also, dents can be formed on both the outer side surfaces of the side ditch or an opening for installing a lid at the upper portion of the side ditch can be formed.