Side seal for linear motion guide unit

A side seal for a linear motion guide unit, comprising

• a seal body that is mounted on an outer side of an end cap mounted on each of the opposite ends of a slider and has a supply port formed therein for a supply of lubricant to a rolling-element directing passage formed in the end cap, and
• a tubular protrusion that is provided on a side face of the seal body facing the end cap, maintains a positional relationship of being inserted into a lubricant supply hole formed in the end cap when the side face of the seal body faces a side face of the end cap, and comprises an insertion portion receiving insertion of a lubricant supply nozzle used for a supply of lubricant, and a supply port connected to the rolling-element directing passage through the lubricant supply hole in a condition in which the tubular protrusion is inserted in the lubricant supply hole, and
• a seal element created on the insertion portion and making close contact with an outer periphery of the lubricant supply nozzle in a process of inserting the lubricant supply nozzle into the insertion portion.