To provide a lid material allowing a seal opening to be easily opened by being pulled and peeled by hand fingers and allowing the seal opening always having a constant size to be opened.

A film-like lid material 2 to be used by sealing an opening part of a container body comprises: a lid material body 4 having a cut line 4a penetrating through all layers for forming a partial opening hole; and a pressure sensitive label 5 stuck thereon. The cut line includes an uncut portion, and a peeling auxiliary cut line penetrating through all the layers of the lid material body is formed behind the uncut portion corresponding to the latter half of the pressure sensitive label in an opening peeling direction.