To give warning of unintended tilted photographing due to shutter operation etc.

A tilt detection part (71) detects a tilt of an imaging apparatus body. In accordance with turning on of a first shutter switch (62) giving instruction to prepare photographing, a system control unit (50) stores a tilt angle in standstill detected by a tilt detection part (71). In accordance with turning on of a second shutter switch (64) giving instruction to execute photographing, the system control unit (50) executes photographing, compares the angle detected by the tilt detection part (71) with a tilt angle taken while preparing photographing, and when there is a fixed difference or more, informs a photographer thereof.