The present disclosure provides an electronic apparatus and an object detection method. The electronic apparatus includes a storage device and a processor. The storage device stores an estimation module. The processor is coupled to the storage device and configured to execute the estimation module. The processor acquires a sensed image provided by an image sensor, and inputs the sensed image to the estimation module so that the estimation module outputs a plurality of estimated parameters. The processor calculates two-dimensional image center coordinates of an object image in the sensed image based on the plurality of estimated parameters, and calculates three-dimensional center coordinates corresponding to the object image based on the two-dimensional image center coordinates and an offset parameter in the plurality of estimated parameters. Thus, the location of the object image in the sensed image can be determined accurately.