In a shift control device and a shift control method of an automatic transmission that establishes a plurality of gear steps of different speed change ratios by selectively engaging a plurality of friction engagement devices, one of a shift start time point and an inertia phase start time point is used as a reference time. The PCB defines a plane of the PCB. In the step of injecting plastic material, the oil control valve holder is set in the one mold with an insert pin being inserted in a hole thereof.