Abstract: The present invention provides a novel pipe connection device for connecting pipes using two or more combined synthetic resin moldings, and a pipe structure. The pipe connection device includes a base member constituted by a polyhedron, at least two surfaces thereof each being formed with a projecting portion, and a connection member that is inserted into a part of a tubular pipe and connected to the base member. The base member is constructed by combining the two or more synthetic resin moldings, each formed with a part of the projecting portion, and the connection member is externally fitted to the projecting portion such that the two or more synthetic resin moldings are fixed in a combined state.