A modular apparatus for realization of wardrobes and the like, characterized in that it comprises the following modules obtained from molding plastic materials: - a first boxed quadrangular panel adapted to act as bottom or shelf for the piece of furniture and also provided, on the upper side, with longitudinal coupling means (1 b) and transversal coupling means (1 a), both provided with stopping means (5a, 5b), which correspond, on the lower side of the same first panel, to longitudinal and transversal coupling means, equally provided with stopping means (5a, 5b); it being provided that said longitudinal coupling means (1 b, 10b) are situated at least in correspondence of the rear longitudinal edge of the first panel and said transversal coupling means (1 a, 10a) are situated in correspondence of the transversal edges and the central area of the first panel - a boxed quadrangular back for the piece of furniture, provided with a lower longitudinal edge and an upper longitudinal edge adapted to cooperate with said longitudinal coupling means (1 b, 10b) of said first panel and also provided with stopping means (13b, 13a) adapted to cooperate with said stopping means (5a, 5b) provided on said longitudinal coupling means (1 b, 10b) of the first panel; - a boxed quadrangular wall adapted to act as side or internal partition of the piece of furniture, provided with a lower longitudinal edge and an upper longitudinal edge adapted to cooperate with said longitudinal coupling means (1 a, 10a) of said first panel and also provided with stopping means (15b, 15a) adapted to cooperate with said stopping means (5a, 5b) provided on said transversal coupling means (1 b, 10b) of the panel; - a boxed quadrangular top for the piece of furniture, provided on the lower side with longitudinal coupling means and transversal coupling means, both provided with stopping means and disposed in specular position to the longitudinal (1 b, 10b) and transversal (1 a, 10a) coupling means of said first panel; it being provided that said longitudinal coupling means of the top are adapted to cooperate with the upper longitudinal edge of the back and the stopping means are adapted to cooperate with the stopping means provided on the upper longitudinal edge of the back; it being provided that said transversal coupling means of the top are adapted to cooperate with the upper longitudinal edge of the wall and the stopping means are adapted to cooperate with the stopping means provided on the upper longitudinal edge of the wall. - a first boxed quadrangular panel adapted to act as bottom or shelf for the piece of furniture and also provided, on the upper side, with longitudinal coupling means (1 b) and transversal coupling means (1 a), both provided with stopping means (5a, 5b), which correspond, on the lower side of the same first panel, to longitudinal and transversal coupling means, equally provided with stopping means (5a, 5b); it being provided that said longitudinal coupling means (1 b, 10b) are situated at least in correspondence of the rear longitudinal edge of the first panel and said transversal coupling means (1 a, 10a) are situated in correspondence of the transversal edges and the central area of the first panel - a boxed quadrangular back for the piece of furniture, provided with a lower longitudinal edge and an upper longitudinal edge adapted to cooperate with said longitudinal coupling means (1 b, 10b) of said first panel and also provided with stopping means (13b, 13a) adapted to cooperate with said stopping means (5a, 5b) provided on said longitudinal coupling means (1 b, 10b) of the first panel; - a boxed quadrangular wall adapted to act as side or internal partition of the piece of furniture, provided with a lower longitudinal edge and an upper longitudinal edge adapted to cooperate with said longitudinal coupling means (1 a, 10a) of said first panel and also provided with stopping means (15b, 15a) adapted to cooperate with said stopping means (5a, 5b) provided on said transversal coupling means (1 b, 10b) of the panel; - a boxed quadrangular top for the piece of furniture, provided on the lower side with longitudinal coupling means and transversal coupling means, both provided with stopping means and disposed in specular position to the longitudinal (1 b, 10b) and transversal (1 a, 10a) coupling means of said first panel; it being provided that said longitudinal coupling means of the top are adapted to cooperate with the upper longitudinal edge of the back and the stopping means are adapted to cooperate with the stopping means provided on the upper longitudinal edge of the back; it being provided that said transversal coupling means of the top are adapted to cooperate with the upper longitudinal edge of the wall and the stopping means are adapted to cooperate with the stopping means provided on the upper longitudinal edge of the wall.