A shock-absorbing device for a stroller includes: a wheel mounting seat including a sleeve part having first and second sides, and an extending part extending outwardly from the first side of the sleeve part; a shock-absorber seat having a first end portion that is formed with a wheel axle-disposing hole, and a second end portion that is pivoted to the second side of the sleeve part, the wheel axle-disposing hole being defined by an axle hole-defining wall; and a resilient shock absorber abutting resiliently against the extending part and the axle hole-defining wall.