A monitoring camera apparatus includes a main circuit board, a sensing circuit board, an adjusting mechanism and a spiral flexible board. The main circuit board includes an image processor. The sensing circuit board includes an image sensor. The adjusting mechanism is connected to the sensing circuit board for adjusting position of the sensing circuit board and/or a lens of the monitoring camera apparatus, so as to vary a rotary angle and an inclined angle of the sensing circuit board relative to the main circuit board. The spiral flexible board has a first end and a second end opposite to each other. The first end and the second end are respectively connected to the main circuit board and the sensing circuit board, so that image information acquired by the image sensor can be transmitted to the image processor via the spiral flexible board.