The present disclosure provides a sliding member including a first sliding body, a second sliding body opposite to the first sliding body, a connection body connected between the first sliding body and the second sliding body, a first convex body disposed on the first sliding body, and a second convex body disposed on the first sliding body. The first convex body has two convex ribs and two convex portions disposed on a top side of the first sliding body to respectively adjacent to the two convex ribs. A movable cover body has two sliding portions respectively movably contacting the two convex ribs and respectively separately contacting the two convex portions. The instant disclosure further provides a zipper head assembly structure using the sliding member.