This mobile X-ray imaging apparatus is provided with an angle sensor (35) and a movement calculation circuit (29). When a fine movement switch (23) issues instructions for movement of the cart (3) in the fine movement mode, the movement calculation circuit (29) controls the driving of the drive wheels (5) on the basis of the degree of turning of the auxiliary wheels (7) with respect to the forward direction of the cart (3). The degree of turning of the auxiliary wheels (7) with respect to the forward direction of the cart (3) is detected by the angle sensor (35) and the rotation of the drive wheels (5) is controlled by the movement calculation circuit (29) so that the auxiliary wheels (7) turn toward the forward direction of the cart (3). Therefore, even when the auxiliary wheels (7) are turned to the left or the right in the traveling mode, the movement calculation circuit (29) quickly turns the auxiliary wheels (7) to the forward direction of the cart (3) in the fine movement mode. As a result, the cart (3) advances correctly in the forward direction according to a rapidly corrected auxiliary wheel (7) turning direction in the fine movement mode. Consequently, it is possible to move the cart (3) forward or backward correctly in the fine movement mode and to adjust the position of the cart (3) as intended.Linvention concerne un appareil dimagerie mobile à rayons X, qui comprend un capteur dangle (35) et un circuit de calcul de mouvement (29). Lorsquun commutateur de mouvement fin (23) délivre des instructions pour le mouvement du chariot (3) dans le mode de mouvement fin, le circuit de calcul de déplacement (29) commande lentraînement des roues motrices (5) sur la base du degré de rotation des roues auxiliaires (7) par rapport à la direction vers lavant du chariot (3). Le degré de rotation des roues auxiliaires (7) par rapport à la direction vers lavant du chariot (3) est détecté par le capteur dangle (35), et la rotation des roues motrices (5) est commandé par le
