To provide an internal combustion engine effectively suppressing the formation of deposited materials in an EGR passage and an intake passage where temperature drop easily occurs.

An EGR device 21 introduces exhaust gas as EGR gas from an engine combustion chamber 13 via the EGR passage 22 into the intake passage 14 and combines it with new air in the passage 14. In a portion of an intake manifold 19 which has contact with both the EGR gas and the new air, a low heat conductive part is provided which has lower heat conductivity than other portions.