A device (1) for use in a pushchair (2) of umbrella-closable type comprising a frame (3) mounted on wheels and carrying a support for a child, said frame (3) having lateral rods (5) extending to the rear of said support and presenting end handgrips (9) rotatable about a longitudinal axis (W) of the corresponding rods (5) in order to be able to lie in a position in which they converge towards a central plane (P) through the frame (3), said device comprising a body (100) presenting elements (39) able to connect as a form fit to recesses (40) provided in said handgrips (9) and comprising elastically loaded members (58) able to releasably connect to corresponding seats (59) provided in said handgrips (9), said connection taking place along a direction perpendicular to that of the connection between said elements (39) and said recesses (40), the body when connected in this manner to the handgrips (9) lying transversely to the central plane (P) through said frame (3) and securely connecting the handgrips (9) together such as to define a handgrip typical of a pushchair of book-closable type.