A cylinder head includes: a plurality of exhaust ports configured to lead out exhaust gas from combustion chambers; a plurality of intake ports configured to introduce fresh air into the combustion chambers; an intake air aggregate part configured to aggregate the plurality of intake ports; and a second EGR pipe in which EGR gas flows, wherein exhaust outlets of the plurality of exhaust ports and an EGR gas inlet of the second EGR pipe are arranged side-by-side on a flat left side surface, and a fresh air inlet of the intake air aggregate part and an EGR gas outlet of the second EGR pipe are arranged side-by-side on a flat right side surface.