Disclosed herein is a flying head slider having an air bearing surface forming portion opposed to a recording medium and adapted to receive a buoyancy produced by air bearing due to a dynamic pressure between the air bearing surface forming portion and a recording surface of the recording medium. The flying head slider includes a head for recording and/or reproducing information, a head mounting portion formed on the air bearing surface forming portion for mounting the head, and a projection of diamond-like carbon provided on the head mounting portion at the upstream side of air flow, which is along the slider, on said head. By providing the projection at the upstream side of air flow on the head, the penetration and deposition of any disturbance such as lubricant and dust to the head can be minimized to thereby prevent damage to the head. Accordingly, the operation reliability of the slider can be improved. Further, an information recording and/or reproducing device including this slider can also be provided.