The present invention provides a bearing device (1) which not only can reduce an amount of lubricating oil supplied to a main bearing (4) but also is excellent in supplying the lubricating oil to a crankpin part. A bearing device (1) includes: a journal part (6), a main bearing (4), a cylinder block (81), and a bearing cap (82). One half bearing (41) held by the cylinder block (81) includes: a first circumferential oil groove (41a) and a second circumferential oil groove (41b) being formed at positions opposite to an inlet (6b) of an oil passage (6a) of the journal part (6); a separation part (41c) separating the first circumferential oil groove (41a) and the second circumferential oil groove (41b); and a first oil hole (41d) and a second oil hole (41e) respectively penetrating from the first circumferential oil groove (41a) and the second circumferential oil groove (41b) to an outer circumferential surface. The cylinder block (81) includes an oil distribution passage (81b) which is formed so as to extend across both the first oil hole (41d) and the second oil hole (41e) of the one half bearing (41).