Abstract: A corner shelf and the system to fix the shelf between corner walls, said system created with the minimum of elements, and hiding these elements with the lateral borders of the shelf. The corner shelf comprises an upper surface, a lower surface, a first lateral face and a second lateral face where said first lateral face possesses a perforation parallel to the upper and lower surfaces; said second lateral face possesses a groove parallel to the surface, and terminating in a perforation being perpendicular to the lower surface. The system of fixation comprises a first fixation element introduced in a perforation located in said first lateral face; and a second fixation element whose horizontal body is introduced in a groove located in said second lateral face, the head of said second fixation element introduced in the perforation which terminates in the groove.