A trolley having a fore-and-aft direction in a horizontal plane, the trolley comprising: - a frame structure (3, 6, 7) comprising two uprights; - a plurality of wheels (4, 8) fixed to a lower part of the frame structure and intended to be in contact with the ground; - a handle disposed at a rear end of the trolley and configured to move the trolley manually; - a housing arranged between the two uprights and fixed thereto, said housing is designed to change from a basket configuration to a seat configuration and vice versa while remaining integral with said frame structure (3, 6, 7); and in that the housing comprises: - a seat comprising a surface whose inclination to the horizontal is less than 10 degrees and located below a backrest; - the backrest (2b, 2c) comprising one or more surfaces whose inclination with respect to the horizontal is greater than 10 degrees and located above the seat; characterised in that the backrest of the housing consists of: - a fixed backrest part located at the rear of the seat and - a movable backrest part; the said seat and the fixed part of the backrest being held without any possible movement with respect to the said frame structure (3, 6, 7), and wherein the movable part of the backrest pivots with respect to said fixed part of the backrest about a pivot axis which is orthogonal to said front-rear direction in said horizontal plane, by an angle of between 160 and 220 degrees when the housing is moved from the basket configuration to the seat configuration or vice versa. - a frame structure (3, 6, 7) comprising two uprights; - a plurality of wheels (4, 8) fixed to a lower part of the frame structure and intended to be in contact with the ground; - a handle disposed at a rear end of the trolley and configured to move the trolley manually; - a housing arranged between the two uprights and fixed thereto, said housing is designed to change from a basket configuration to a seat configuration and vice versa while remaining integral with said frame structure (3, 6, 7); and in that the housing comprises: - a seat comprising a surface whose inclination to the horizontal is less than 10 degrees and located below a backrest; - the backrest (2b, 2c) comprising one or more surfaces whose inclination with respect to the horizontal is greater than 10 degrees and located above the seat; - a seat comprising a surface whose inclination to the horizontal is less than 10 degrees and located below a backrest; - the backrest (2b, 2c) comprising one or more surfaces whose inclination with respect to the horizontal is greater than 10 degrees and located above the seat; characterised in that the backrest of the housing consists of: - a fixed backrest part located at the rear of the seat and - a movable backrest part; - a fixed backrest part located at the rear of the seat and - a movable backrest part; the said seat and the fixed part of the backrest being held without any possible movement with respect to the said frame structure (3, 6, 7), and wherein the movable part of the backrest pivots with respect to said fixed part of the backrest about a pivot axis which is orthogonal to said front-rear direction in said horizontal plane, by an angle of between 160 and 220 degrees when the housing is moved from the basket configuration to the seat configuration or vice versa.