This article aims at formulating an indicator of centrality that consider a trip generation and trip distance in cities and at clarifying its expressibility by comparison with betweenness centrality and advantage of position in a virtual city with grid street networks. The indicator is obtained by integrating the number of trips on the assumption of moving behavior with exponential distance decay, and is formulated as the location potential.It can express various centralities according to the city size, purposes and means of transportation, and facilities for various age groups by adjusting the parameters to the actual travel behavior.