In order to provide a stepping motor drive apparatus and a stepping motor driving method that attain a constant rotation angle per step at every angular position despite variations in load and that are free of rotational fluctuation, a drive control unit of a stepping motor drive apparatus drives a driving coil of one phase of a stepping motor (11) with a first drive signal (DS1) having a first absolute value, and at the same time, drives a driving coil of the other phase of the stepping motor with a second drive signal (DS2) having a second absolute value. The first absolute value and the second absolute value each have a value being different from each other's, and a ratio (d) between the first absolute value and the second absolute value is constant.