The present invention relates to an electrochromic device having at least one active area (CDEF), having, on a carrier substrate (3), a multilayer stack comprising a layer forming a lower electrode (4), various functional layers (7) at least one of which is an electrochromic layer, at least one (6, 7a) of these layers being electrically insulating, and an upper electrode (9), in which device: at least one partition (5) separating the surface of the lower electrode (4) into two isolated regions, namely a free region (4a) and an active region (4b) containing the active area (CDEF); and at least one partition (12) separating the surface of the upper electrode (9) into two regions electrically isolated from each other, namely a free region (9a) and an active region (9b) containing the active area (CDEF).