Disclosed is an array camera. The array camera includes an array camera comprising an image sensor sectioned into at least two channels and at least two lens modules each positioned on a top of one of the channels. Each channel consists of an active sensor area and a dead space. Each lens module has a barrel. Each barrel of the lens modules has an inner sidewall facing the adjacent lens modules and an outer sidewall opposite to the inner surface. Wherein, a projection of the inner sidewall of each barrel along the optical axis is an inner line on the corresponding channel of the image sensor and the inner line is substantially superposed with a part of the outline of the active sensor. The array camera has a small size.