To provide a drilling unit capable of reducing the weight of a drill pipe without deteriorating drilling capability, and the drill pipe for the drilling unit.

This drilling unit (10) includes a drill body (1). The drill body (1) is held in a suspended state in a holding mechanism (5). The drill body (1) comprises the drill pipe (11); and the drill pipe (11) comprises a hollow cylindrical body (12), and a blade (13) which is elongated outward from the body (12). In the blade (13), a plurality of through-holes (13a) are formed in line along the longitudinal direction of the body (12).