REDUCTION GEAR

PROBLEM TO BE SOLVED: To prevent a seal member from being abraded and damaged in an early stage by collecting metal abrasion powder generated in a housing and sealing lubricant oil in the housing. SOLUTION: A bottom side housing 5 of a housing 31 is provided with a bottom side bearing 9 rotatably supporting an output shaft 11 of a reduction gear mechanism. A sleeve 34 axially supporting the bottom side bearing 9 in a space toward a pinion 11A is inserted in the output shaft 11 and an annular oil sump 34A and a plurality of magnetic boards 26 are provided in the upper side of the sleeve 34. An oil seal 23 slidably touching with the outer circumferential face of the sleeve 34 is installed in the internal circumferential side of a cover 32 of the housing 31 and lubricating oil lubricating the reduction gear mechanism is sealed inside the housing 31 by the oil seal 23. An annular eaves 33 positioned between the bottom side bearing 9 and the sleeve 34 and projecting diametrically inward is provided in the cover 32 and the tip edge of the annular eaves 33 is projected more diametrically inward than the outer ring 9B of the bottom side bearing 9.