A marine hose fluid leakage detection system that detects a leakage of a fluid flowing through a marine hose, the marine hose including: an inner circumferential reinforcing layer and an outer circumferential reinforcing layer, being layered on an outer circumferential side of a flow channel; a fluid retention layer interposed between the inner circumferential reinforcing layer and the outer circumferential reinforcing layer; and a buoyant layer layered on the fluid retention layer on its outer circumferential side, the marine hose fluid leakage detection system comprising: the marine hose; an IC tag of a passive type installed in the fluid retention layer at a predetermined position in a longitudinal direction of the marine hose; and a radio wave transmitter and a radio wave receiver disposed outside the marine hose, the radio wave receiver receiving radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, a cover layer formed of a soluble member and formed of an oil-based coating material that is dissolvable by the fluid, the IC tag being configured to cause a change in strength of the radio waves transmitted from the IC tag to be received by the radio wave receiver according to whether the soluble member is dissolved, and whether the fluid leaks being determined based on the strength of the radio waves transmitted from the IC tag and received by the radio wave receiver; characterized in that the IC tag includes an IC chip, an antenna portion and the cover layer covering the entire IC chip; and the fluid is refined oil or crude oil. the marine hose including: an inner circumferential reinforcing layer and an outer circumferential reinforcing layer, being layered on an outer circumferential side of a flow channel; a fluid retention layer interposed between the inner circumferential reinforcing layer and the outer circumferential reinforcing layer; and a buoyant layer layered on the fluid retention layer on its outer circumferential side, the marine hose fluid leakage detection system comprising: the marine hose; an IC tag of a passive type installed in the fluid retention layer at a predetermined position in a longitudinal direction of the marine hose; and a radio wave transmitter and a radio wave receiver disposed outside the marine hose, the radio wave receiver receiving radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, a cover layer formed of a soluble member and formed of an oil-based coating material that is dissolvable by the fluid, the IC tag being configured to cause a change in strength of the radio waves transmitted from the IC tag to be received by the radio wave receiver according to whether the soluble member is dissolved, and whether the fluid leaks being determined based on the strength of the radio waves transmitted from the IC tag and received by the radio wave receiver; characterized in that the IC tag includes an IC chip, an antenna portion and the cover layer covering the entire IC chip; and the fluid is refined oil or crude oil. the marine hose; an IC tag of a passive type installed in the fluid retention layer at a predetermined position in a longitudinal direction of the marine hose; and a radio wave transmitter and a radio wave receiver disposed outside the marine hose, the radio wave receiver receiving radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, a cover layer formed of a soluble member and formed of an oil-based coating material that is dissolvable by the fluid, the IC tag being configured to cause a change in strength of the radio waves transmitted from the IC tag to be received by the radio wave receiver according to whether the soluble member is dissolved, and whether the fluid leaks being determined based on the strength of the radio waves transmitted from the IC tag and received by the radio wave receiver; characterized in that the IC tag includes an IC chip, an antenna portion and the cover layer covering the entire IC chip; and the fluid is refined oil or crude oil.