Automatic transmission control device

An automatic transmission control device for an automatic transmission, comprising:

• a shift control section configured to implement a downshift by disengagement of a first frictional engagement element, wherein the first frictional engagement element is engaged in a gear position before the downshift;
• an engine state determination section configured to determine whether or not an engine state is in a predetermined region in which a change of an engine torque per a change of an accelerator pedal opening is smaller than that in another region, and the engine torque is within a predetermined range, and an engine rotational speed is within a predetermined range;
• an operating state determination section configured to determine whether or not an operating state is in a predetermined state of accelerator operation in which the accelerator pedal opening is larger than or equal to a predetermined value, and an accelerator pedal opening change rate has an absolute value smaller than or equal to a predetermined value;
• and
• a downshift inhibition section configured to inhibit the downshift in response to a combination of a determination by the engine state determination section that the engine state is in the predetermined region and a determination by the operating state determination section that the operating state is in the predetermined state of accelerator operation.