An engine intake system configured to supply gas at least containing fresh air to each cylinder of an engine, the engine intake system comprising: a throttle valve configured to adjust or regulate an intake amount of the fresh air; an intake passage having an internal space in which the fresh air having flowed through the throttle valve is introduced into the cylinder of the engine; and an EGR passage (41, 46) that communicates with the internal space of the intake passage and configured to introduce some of exhaust gas as EGR gas into the intake passage, wherein the internal space of the intake passage is defined by a fresh air introduction passage, a surge tank, and independent intake pipes, the EGR passage (41, 46) is configured to include a first exhaust gas introduction passage, a second exhaust gas introduction passage, a third exhaust gas introduction passage and a fourth exhaust gas introduction passage, the EGR passage (41, 46) further includes a projected section in a substantially polygonal or cylindrical shape that is configured to project to the internal space of the intake passage, the projected section is formed in such a shape that a projection length on an upstream lateral surface is longer than a projection length on a downstream lateral surface, the intake passage is configured by joining an inner divided body, an intermediate divided body, and an outer divided body, a channel component, that constitutes the EGR passage (41, 46), is held between the inner divided body and the intermediate divided body, the fourth exhaust gas introduction passage is constructed of the channel component and the intermediate divided body, the projected section is configured to communicate with the fourth exhaust gas introduction passage by the inner divided body and the channel component, characterised in that: the first exhaust gas introduction passage is constructed of a cylindrical body that is integrally formed with the outer divided body, the first exhaust gas introduction passage is formed in a shape that extends substantially downward and in a width direction, the second exhaust gas introduction passage is constructed of the outer divided body and the intermediate divided body, the second exhaust gas introduction passage is formed in a shape that extends substantially downward along the independent intake pipe from the first exhaust gas introduction passage, the third exhaust gas introduction passage is constructed of a cylindrical body that is integrally formed with the intermediate divided body, the third exhaust gas introduction passage is formed in a shape that extends in the width direction from the second exhaust gas introduction passage, and the fourth exhaust gas introduction passage is formed in a shape that extends forward along the fresh air introduction passage from the third exhaust gas introduction passage. a throttle valve configured to adjust or regulate an intake amount of the fresh air; an intake passage having an internal space in which the fresh air having flowed through the throttle valve is introduced into the cylinder of the engine; and an EGR passage (41, 46) that communicates with the internal space of the intake passage and configured to introduce some of exhaust gas as EGR gas into the intake passage, wherein the internal space of the intake passage is defined by a fresh air introduction passage, a surge tank, and independent intake pipes, the EGR passage (41, 46) is configured to include a first exhaust gas introduction passage, a second exhaust gas introduction passage, a third exhaust gas introduction passage and a fourth exhaust gas introduction passage, the EGR passage (41, 46) further includes a projected section in a substantially polygonal or cylindrical shape that is configured to project to the internal space of the intake passage, the projected section is formed in such a shape that a projection length on an upstream lateral surface is longer than a projection length on a downstream lateral surface, the intake passage is configured by joining an inner divided body, an intermediate divided body, and an outer divided body, a channel component, that constitutes the EGR passage (41, 46), is held between the inner divided body and the intermediate divided body, the fourth exhaust gas introduction passage is constructed of the channel component and the intermediate divided body, the projected section is configured to communicate with the fourth exhaust gas introduction passage by the inner divided body and the channel component, the first exhaust gas introduction passage is constructed of a cylindrical body that is integrally formed with the outer divided body, the first exhaust gas introduction passage is formed in a shape that extends substantially downward and in a width direction, the second exhaust gas introduction passage is constructed of the outer divided body and the intermediate divided body, the second exhaust gas introduction passage is formed in a shape that extends substantially downward along the independent intake pipe from the first exhaust gas introduction passage, the third exhaust gas introduction passage is constructed of a cylindrical body that is integrally formed with the intermediate divided body, the third exhaust gas introduction passage is formed in a shape that extends in the width direction from the second exhaust gas introduction passage, and the fourth exhaust gas introduction passage is formed in a shape that extends forward along the fresh air introduction passage from the third exhaust gas introduction passage.