The present invention concerns a furniture module of a cupboard, book shelf, chests of drawers and like furniture. The module (1) is formed of two opposite sides (2, 3) and a top (5) and bottom (4) placed at opposite ends of the sides (2, 3), forming a frame. At least two columns of mounting openings (6, 7, 8, 9) are placed on the inside of the sides (2, 3) for attaching shelves, drawers, doors etc. The mounting openings (6, 7, 8, 9) of each column are placed at even spacing, giving an equal distance (M) between adjacent mounting openings (6, 7, 8, 9). The distance between the uppermost mounting opening (6, 7, 8, 9) in each column of mounting openings and the upper side of the module (1) is one and a half (M+½M) of the distance between adjacent mounting openings (6, 7, 8, 9). Also the distance between the lowermost mounting hole in the column of mounting holes and the lower side of the module (1) is one and a half (M+½M) of the distance between adjacent mounting openings (6, 7, 8, 9).