A stroller

A stroller comprises a frame assembly 70 having a plurality of first fasteners 76, and a seat 80 including a seat body 81 and a plurality of attachment portions 82L-85L, 82R-85R extending from two sides of the seat body, each of the attachment portions being provided with a second fastener 86. The second fasteners are removably connected to the correspondent first fasteners of the frame assembly so as to detachably attach the seat to the frame assembly. One of the attachment portions is provided with a third engagement element 823, and another one of the attachment portions on the same side of the seat body is provided with a seventh engagement element (854, figure 4) engageable with the third engagement element. The third and seventh engagement elements are particularly intended to be connected together when upper and lower stroller frames 71, 72 are collapsed about pivots 73, said connection thus maintaining the stroller in the collapsed state. Each of the attachment portions may be provide with further engagement elements for connecting the frame and seat.