A linear motion guide device includes a slider slidably attached onto a guide rail, an end cap and a wiper device attached to each side of the slider, the wiper device includes two wiping members to be easily and detachably attached to each of the end cap without tools and fasteners. The wiping members each include one or more projections or one or more latches for engaging with the end cap and for anchoring and positioning the wiping members to the end cap without tools and fasteners. The end cap includes a space separated into two chambers and for receiving the wiping members respectively. The wiping members each include a soft wiping portion for resiliently engaging with the guide rail.