In the open channel containing streaming water the surface pressure distributions over the submerged circular cylinder were measured, and then the forces were calculated by pressure integration. From these results the effect of submersion depth on the forces was discussed in detail. The main results are as follows (1) In the region of laminar separation and transition, the wave resistance is comparably large. This results from the rearward movement of the position of minimum pressure by the gravity force. (2) In the region of turbulence separation the form resistance decreases. This results from the rearward movement of the separation point by slackening of pressure increment in the after part. (3) The effect of laminar flow begins to mixrin the small submersion depth even if the Reynolds number in the large submersion depth is above critical one.