The present invention provides a stretch fabric substrate for medical use in a simple knitted structure with a good productivity having such a desired elastic recovery of elongation that no reduction of the fabric substrate in the widthwise direction takes place when elongation is applied to a necessary extent in the lengthwise direction. The fabric substrate according to the present invention is constituted by means of a warp knit substrate, the warp knit substrate is formed by means of a chain stitch using a stretch multifilament textured yarn and elastic yarns and non-stretch yarns are inserted in the lengthwise direct ion and in the widthwise direction, respectively to the chain stitch.