To provide a spacer for sliding material for a ship landing slipway for solving the problem caused by a ship landing rope getting into a gap between the end parts of adjacent sliding material, facilitating execution of construction, hardly causing deterioration and attaining excellent durability.

This spacer for a sliding material for a ship landing slipway is interposed in a gap 3 between the adjacent end parts of bar-like sliding materials 2 having a designated length, which are arranged side by side in multiple in the direction substantially intersecting perpendicularly to the direction of inclination of a ship landing slipway 1. Both right and left sides of the spacer body 4 are provided with a covering part 5 put on the end of the sliding material 2. A closing top plate part 6 for closing the gap between the end parts of the arranged sliding materials 2 when the respective end parts of the arranged sliding materials 2 are covered with the right and left covering part 5 is provided on the upper part of the spacer body 4, and the ship landing rope 7 is inhibited from entering the gap 3 by the closing top plate part 6.