The present invention discloses an acceleration measuring apparatus capable of calibrating its output with a zero-point in the state of no acceleration applied as well as sensitivity. The acceleration measuring apparatus comprises: an acceleration sensor that detects each component of an acceleration and creates an output based on each of the detected component in each direction of at least two mutually perpendicular axes of orthogonal coordinates for acceleration sensor; a holding means that holds the acceleration sensor at least two different positions, in which the acceleration sensor axes at one position which is at a different angle with the gravitational acceleration direction from the other; and a processing circuit. The processing circuit develops the calibration parameters based on the output by each component in the at least two axis directions of the gravitational acceleration measured by the acceleration sensor positioned at each of the at least two different positions and calibrates the output of the acceleration measured by using the calibration parameters to provide the calibrated output.