Light detection device and ct device provided with light detection device

[Problem] To provide a light detection device in which it is possible to inhibit holes from remaining, and a CT device equipped with the light detection device. [Solution] A light detection device according to the present embodiment is provided with at least one photodiode having: a first electrode, an n-type semiconductor layer provided on the first electrode; a first p-type semiconductor layer provided on the n-type semiconductor layer, the first p-type semiconductor layer having a first surface region and a second surface region; a second p-type semiconductor layer provided on the first surface region of the first p-type semiconductor layer, the second p-type semiconductor layer having a higher p-type impurity concentration than the first p-type semiconductor layer; and a second electrode provided on the second surface region of the first p-type semiconductor layer and on the second p-type semiconductor layer.