A solid-state imaging device includes a first chip including a plurality of pixels, each pixel including a light sensing unit generating a signal charge responsive to an amount of received light, and a plurality of MOS transistors reading the signal charge generated by the light sensing unit and outputting the read signal charge as a pixel signal, a second chip including a plurality of pixel drive circuits supplying desired drive pulses to pixels, the second chip being laminated beneath the first chip in a manner such that the pixel drive circuits are arranged beneath the pixels formed in the first chip to drive the pixels, and a connection unit for electrically connecting the pixels to the pixel drive circuits arranged beneath the pixels.

A radiation image capturing apparatus is provided. The radiation image capturing apparatus includes an image capturing unit configured to capture a radiation image. The image capturing unit includes a detection element configured to detect radiation. The radiation image capturing apparatus comprises a processor configured to perform, in accordance with an exposure request from a user, a first reset operation of resetting the detection element, and configured to detect an amount of irradiation of the radiation based on a signal from the detection element after the first reset operation.

A radiation image capturing apparatus is provided. The radiation image capturing apparatus includes an image capturing unit configured to capture a radiation image. The image capturing unit includes a detection element configured to detect radiation. The radiation image capturing apparatus comprises a processor configured to perform, in accordance with an exposure request from a user, a first reset operation of resetting the detection element, and configured to detect an amount of irradiation of the radiation based on a signal from the detection element after the first reset operation.