A mobile concrete pump including a building frame (22) arranged on the structure (12) of a truck chassis (10). The building frame (22) includes two longitudinal side members (50) mutually spaced apart by a free space (52) and resting on the chassis structure (12). The mobile concrete pump further comprises a driving assembly (42) for actuating the functional units, which are arranged with the core pump (24) in the free space zone (52) located between the two longitudinal side members (50). At least the core pump can be easily mounted and dismounted from the building frame (22). For this, the building frame (22) is provided with a floating bearing (54) which links the side members across the free space, as well as a fixed bearing (56) arranged at the rear end of the building frame and serving to support releasably the core pump (24) which is pre-assembled in modular manner.