A corrected exhaust gas pressure loss calculation device comprising an engine whose exhaust passage comprises a filter configured to collect microparticles contained in an exhaust gas, a calculating unit configured to calculate a corrected exhaust gas pressure loss serving as an exhaust gas pressure loss under a predetermined reference condition in the exhaust passage, the corrected exhaust gas pressure loss calculation device comprising: an exhaust gas pressure measuring unit (32, 30a, 30e) configured to measure an exhaust gas pressure (P ex) in the exhaust passage; an exhaust gas mass flow rate measuring unit configured to measure an exhaust gas mass flow rate in the exhaust passage; and an exhaust gas temperature measuring unit (34, 28a, 28e), configured to measure an exhaust gas temperature (T ex) in a portion of the exhaust passage, wherein the calculating unit is furthermore configured to convert the exhaust gas pressure (P ex) into a corrected exhaust gas pressure loss (P ex,adj) serving as the exhaust gas pressure loss under the reference condition based on: • a relationship between the exhaust gas mass flow rate (g ex) and an exhaust gas mass flow rate under the reference condition (g exs); • a relationship between the exhaust gas temperature (T ex) and an exhaust gas temperature under the reference condition (T b); • a relationship between the exhaust gas pressure (P ex) and an exhaust gas pressure under the reference condition (P b); and • a relationship between an exhaust gas viscosity coefficient (η) under a condition of the exhaust gas temperature and a viscosity coefficient of a viscous gas under the reference condition (η b), the corrected exhaust gas pressure loss (P ex,adj) being defined by the equation: P exx, adj = P ex ⋅ g exs g ex ⋅ K 0 + T b K 0 + T ex ⋅ P ex P 0 + P b ⋅ η b η where P exx,adj is the corrected exhaust gas pressure loss, g ex is the exhaust gas mass flow rate, g exs is the exhaust gas mass flow rate under the reference condition, K 0 is a standard temperature, P ex is the exhaust gas pressure, P 0 is a standard pressure, T b is the exhaust gas temperature under the reference condition, P b is the exhaust gas pressure under the reference condition, r) is the viscosity coefficient of the exhaust gas, η b is the viscosity coefficient of the exhaust gas under the reference condition. an exhaust gas pressure measuring unit (32, 30a, 30e) configured to measure an exhaust gas pressure (P ex) in the exhaust passage; an exhaust gas mass flow rate measuring unit configured to measure an exhaust gas mass flow rate in the exhaust passage; and an exhaust gas temperature measuring unit (34, 28a, 28e), configured to measure an exhaust gas temperature (T ex) in a portion of the exhaust passage, wherein the calculating unit is furthermore configured to convert the exhaust gas pressure (P ex) into a corrected exhaust gas pressure loss (P ex,adj) serving as the exhaust gas pressure loss under the reference condition based on: • a relationship between the exhaust gas mass flow rate (g ex) and an exhaust gas mass flow rate under the reference condition (g exs); • a relationship between the exhaust gas temperature (T ex) and an exhaust gas temperature under the reference condition (T b); • a relationship between the exhaust gas pressure (P ex) and an exhaust gas pressure under the reference condition (P b); and • a relationship between an exhaust gas viscosity coefficient (η) under a condition of the exhaust gas temperature and a viscosity coefficient of a viscous gas under the reference condition (η b), the corrected exhaust gas pressure loss (P ex,adj) being defined by the equation: P exx, adj = P ex ⋅ g exs g ex ⋅ K 0 + T b K 0 + T ex ⋅ P ex P 0 + P b ⋅ η b η where P exx,adj is the corrected exhaust gas pressure loss, g ex is the exhaust gas mass flow rate, g exs is the exhaust gas mass flow rate under the reference condition, K 0 is a standard temperature, P ex is the exhaust gas pressure, P 0 is a standard pressure, T b is the exhaust gas temperature under the reference condition, P b is the exhaust gas pressure under the reference condition, r) is the viscosity coefficient of the exhaust gas, η b is the viscosity coefficient of the exhaust gas under the reference condition. • a relationship between the exhaust gas mass flow rate (g ex) and an exhaust gas mass flow rate under the reference condition (g exs); • a relationship between the exhaust gas temperature (T ex) and an exhaust gas temperature under the reference condition (T b); • a relationship between the exhaust gas pressure (P ex) and an exhaust gas pressure under the reference condition (P b); and • a relationship between an exhaust gas viscosity coefficient (η) under a condition of the exhaust gas temperature and a viscosity coefficient of a viscous gas under the reference condition (η b),