An elastic knitted fabric comprising an elastic yarn and a non-elastic yarn, the elastic knitted fabric being characterized in that: the elastic yarn content is 20-60 g/m 2 ; when the knitted fabric is stretched to 80% and then returned to the original length and the forward-movement stress and the return-movement stress at the 50% point during the stretching and contracting are measured, the stress ratio measured using the following relationship: stress ratio = (return-movement stress (N) at the 50% point)/(forward-movement stress (N) at the 50% point) is 0.40-0.80; and the instantaneous temperature rise caused by heat generation during stretching in the warp and/or weft direction is at least 1.0°C.