A hull attitude control apparatus (1) includes: an outboard engine (3) that includes a propeller (12) which is provided on a hull (2) and generates a thrust force at the hull (2) and a propeller drive motor (9) which drives the propeller (12); an attitude control portion (4) that controls an inclination angle of a propeller rotation axis line (S2); an outboard engine control portion (20) that performs a drive control of the propeller drive motor (9); and a shake detection sensor that detects a shake of the hull (2). The attitude control portion (4) and the outboard engine control portion (20) perform a drive control of the propeller (12) so as to prevent shaking of the hull (2) based on a detection result of the shake detection sensor.