Disclosed is a method for producing a jointless shower tray, which is installed in baths, or as a separate shower stall, with or without supporting bodies, which is advantageously level with the adjoining floor, and to a jointless shower tray. The drainage surface that collects water and guides it to the drainage opening of the shower tray is created from a material block having at least one plane-parallel surface by way of a material removal machining method. The drainage surface is produced in one operation using a program-controlled three-dimensional machining method, wherein the edge region of the shower tray transitions continuously into the drainage surface at least in the entrance and exit region thereof. This very convenient machining method can be used to configure the surface of the shower bottom, in one uninterrupted operation, in various shapes and without any shoulder whatsoever. In this way, custom-produced shower trays can be produced relatively inexpensively, in any shape desired by the customer, and without edges that would be detrimental to slip-free conditions.