To provide a bogie type lower roller device of a crawler type vehicle having a bogie bracket for reducing the number of parts, the size and weight, and the welding strain and welding time.

Lower rollers (23 and 24) non-turnably couple a lower roller shaft (27) with two bearing bodies (25 and 26) which support right and left ends of the lower roller shaft (27) and have bogie bracket fitting seat parts (30 and 31). The bogie bracket (8) has a pair of right and left bogie plate bodies (11 and 12) having two front and rear bearing body coupling seat parts (20 and 21) to integrally couple the right and left bearing bodies (25 and 26) of the lower rollers (23 and 24), couples the bearing body coupling seat parts (20 and 21) of the bogie plate bodies (11 and 12) with the bogie bracket fitting seat parts (30 and 31) of the bearing bodies (25 and 26) by bolts, and fits the pair of front and rear lower rollers (23 and 24) to the pair of right and left bogie plate bodies (11 and 12).