A water overflow edge device for a swimming pool is having a channel consisting of bottom, rear and front walls is disclosed. The front wall is made of a plurality of modular structural elements arranged in sequence and coupled together “end-to-end”. The channel is also covered on top by a walking grid that allows swimming pool water to enter. Each modular structural element has a first component with structural function, provided at the bottom with coupling means with the bottom wall of the channel and with the top of the vertical inner wall of the swimming pool. The structural component includes at one side with a first surface, which forms the front wall of the channel, and with a second substantially vertical surface, opposite the first surface and configured to support a second coating component which forms the entire exposed surface of the water overflow edge device and which has a finishing function. Preferably, the first component is plastic and the second coating component is ceramic.