To provide a device which easily estimates a prime cost by input of specification data.

This device for estimating the prime cost is provided with a specification data reception means which receives specification data of a product as the prime cost estimation object, a product information retrieval command transmission means which transmits a product information retrieval command to a product information management system in order to retrieve product information data on the basis of received specification data, a prime cost retrieval command transmission means which transmits a prime cost data retrieval command to a prime cost data management system in order to retrieve prime cost data when receiving product information data, and a prime cost data transmission means which transmits prime cost data of the product in relation to product information data when receiving prime cost data.