Each boot of a tripot type constant velocity joint comprises a polyester-based thermoplastic elastomer (TPC). A grease encapsulated in the boot comprises a base oil, a thickening agent comprising a diurea-based compound, molybdenum dialkyldithiocarbamate sulfide, a sulfur-phorsphorous based extreme-pressure agent being a sulfur-phosphorus based compound containing sulfur and phosphorous as constituting elements, and potassium borate hydrate.