The digital camera 1, when a length-direction range expanding button 14 or a breadth-direction range expanding button 15 is operated, changes the length-direction and breadth-direction image pickup effective ranges of a solid state image pickup device 40 using an image pickup effective range setting table 41. Due to this, there can be obtained picked-up images with a length-to-breadth ratio changed without rotating the main body of the digital camera 1. Also, since the length-direction and breadth-direction image pickup effective ranges are adjusted such that the area of the image pickup effective ranges of the solid state image pickup device 40 can provide a substantially constant value, there can be always obtained an image of good quality.