A conveying device, a cardiac pacing device, and a fixing structure thereof. The fixing structure comprises a housing (11), a driving member (12), and an elastic member (13). The housing (11) comprises a first inner cavity (112) and a recess (111). The driving member (12) is partially accommodated in the first inner cavity (112). One end of the driving member (12) extends from an end portion of a proximal end of the first inner cavity (112), and is detachably connected to a driving sheath (22). The elastic member (13) is accommodated in the first inner cavity (112). One end of the elastic member (13) is connected to the driving member (12), and the other end extends to the exterior of the driving member (12), and extends into the recess (111). The driving member (12) is connected to and engages with the housing (11), and drives, in an axial direction of the housing (11), the elastic member (13) to move inside the recess (111), so as to cause the elastic member (13) to extend out of or retract back to the recess (111), thereby allowing a cardiac pacing device to be fixed in a human body or recovered and allowing a pacing position to be readjusted. The invention has a simple structure, is easy to operate, has no requirement on the thickness of a tissue wall, and is easy to secure. Thus, a cordless pacing device can be fixed in a ventricle or an atrium, thereby achieving dual-chamber pacing, and achieving ventricle-atrium synchronized physiological pacing.L'invention concerne un dispositif de transport, un dispositif de stimulation cardiaque et une structure de fixation associée. La structure de fixation comprend un boîtier (11), un élément d'entraînement (12) et un élément élastique (13). Le boîtier (11) comprend une première cavité interne (112) et un évidement (111). L'élément d'entraînement (12) est partiellement logé dans la première cavité interne (112). Une extrémité de l'élément d'entraînement (12) s'étend à partir d'une partie d'extrémité d'une extrémité proxi
