A pressure detection device comprising: a fluid inflow member having a flow passageway into which a fluid can be flown; a semiconductor type pressure sensor which is provided on a top face of the fluid inflow member, and detects a pressure of the fluid having flown into the flow passageway; a first unit having: a first resin section which is provided on the top face of the fluid inflow member, and surrounds the semiconductor type pressure sensor; and a first lead terminal which is retained by the first resin section, one end part of which is electrically connected to the semiconductor type pressure sensor; a lid section which is coupled to the first resin section so as to cover the semiconductor type pressure sensor from an upper side, and forms a closed space in which the semiconductor type pressure sensor is internally positioned; characterised by a second unit having: a second resin section to cover the lid section from an upper side; and a second lead terminal which is retained by the second resin section, and is electrically connected to an other end part of the first lead terminal; and a resin cover section which couples the fluid inflow member and the first unit and the lid section and the second unit, and covers the first unit, the lid section, and the second unit, while a part of the second lead terminal of the second unit is exposed to an outside, wherein the lid section is coupled to the first resin section, and is pressed by the resin cover section from an upper side. a fluid inflow member having a flow passageway into which a fluid can be flown; a semiconductor type pressure sensor which is provided on a top face of the fluid inflow member, and detects a pressure of the fluid having flown into the flow passageway; a first unit having: a first resin section which is provided on the top face of the fluid inflow member, and surrounds the semiconductor type pressure sensor; and a first lead terminal which is retained by the first resin section, one end part of which is electrically connected to the semiconductor type pressure sensor; a first resin section which is provided on the top face of the fluid inflow member, and surrounds the semiconductor type pressure sensor; and a first lead terminal which is retained by the first resin section, one end part of which is electrically connected to the semiconductor type pressure sensor; a lid section which is coupled to the first resin section so as to cover the semiconductor type pressure sensor from an upper side, and forms a closed space in which the semiconductor type pressure sensor is internally positioned; characterised by a second unit having: a second resin section to cover the lid section from an upper side; and a second lead terminal which is retained by the second resin section, and is electrically connected to an other end part of the first lead terminal; and a second resin section to cover the lid section from an upper side; and a second lead terminal which is retained by the second resin section, and is electrically connected to an other end part of the first lead terminal; and a resin cover section which couples the fluid inflow member and the first unit and the lid section and the second unit, and covers the first unit, the lid section, and the second unit, while a part of the second lead terminal of the second unit is exposed to an outside, wherein the lid section is coupled to the first resin section, and is pressed by the resin cover section from an upper side.