1. An electronic mirror apparatus comprising: a camera mounted at one-side or each of both-side surfaces of a vehicle, the camera including an imaging part taking an image in a rear-and-side directions of the vehicle, and a processing part coupled to the imaging part; and a display part mounted in the vehicle interior and coupled to the processing part of the camera and configured to display images, wherein the processing part is programmed to: transform a taken image taken by the imaging part to a transformed image, the taken image having a wider angle of view than the transformed image, transmit the transformed image to the display part to cause the display part to display the transformed image when a shift position of the vehicle is a forward position, and transmit the taken image to the display part to cause the display part to display the taken image when the shift position is a reverse position and a duration of the reverse position is greater than or equal to a predetermined period of time, transmit the taken image to the display part to cause the display part to display the taken image when the shift position is the reverse position and an absolute value of a steering angle of the vehicle is greater than or equal to a first threshold, transmit the taken image to the display part to cause the display part to display the taken image when the shift position is the reverse position, the absolute value of the steering angle is greater than or equal to the first threshold, and the vehicle speed is less than or equal to a predetermined speed, and transmit the taken image to the display part to cause the display part to display the taken image when the shift position is the reverse position, the duration of the reverse position is greater than or equal to the predetermined period of time, and the vehicle speed is less than or equal to the predetermined speed.