Abstract: A filling apparatus (10) for filling capsules with powdered substances for pharmaceutical or parapharmaceutical use or the like, includes a body-machine (12) inside which the mechanical and electrical and/or electronic components are housed which are adapted to operate an operating unit (14) comprising a body (18) supporting a rotating table (19) adapted to receive capsules to be filled with a powdered product from a capsule feeding station (22), move them in the direction of a filling station (24) functional for filling said capsules with the powdered product and eject them once filled at an ejection station (26), the apparatus in which the filling station (24) includes a tamping filling unit (40) or a dosing filling unit (42) which are interchangeable with respect to the body-machine for a variation of the filling configuration of the capsules with the powdered product.