Abstract: A safety device in connection with a child seat in a shopper trolley. The safety device prevents a child, placed on the seat (22) from being able to pull its legs out of the openings formed through the end wall (10) of the shopper trolley. The child seat (22) is pivotally suspended from the end wall (10), which can preferably be swung inwards/upwards in the shopper trolley about a horizontal axis, when shopper trolleys are being stacked horizontally. The child seat (22) is placed adjacent to the through opening (14′, 14″) for the child's legs. At their bottoms and sides the openings are defined by elements (10′, 10″, 16′, 16″, 20) included in the end wall (10).