Abstract: A tubular gearmotor for curtains, shutters, roller blinds or the like, comprises a support which is suitable for being fixed to a support surface and which receives a head of the tubular gearmotor which can be inserted in an insertion direction substantially coinciding with the axial extension of the gearmotor. The support is provided with means preventing the axial rotation of the head and with releasable-engagement means for preventing axial extraction of the head. The releasable-engagement means comprise locking/fixing members which are circumferentially distributed around the axis for insertion of the head and which are each movable between a first engaging position and a second disengaging position. An actuating member is also provided, said actuating member, when manually operated, performing the displacement of the locking/fixing members between the first and the second position.