A marine hose fluid leakage detection system for detecting leakage of fluid flowing through a flow path of a marine hose, comprising the marine hose, wherein the marine hose comprises an inner reinforcing layer and an outer reinforcing layer laminated on an outer peripheral side of the flow path, a fluid retention layer interposed between the inner reinforcing layer and the outer reinforcing layer, a buoyant layer laminated on an outer peripheral side of the fluid retention layer and at least one connecting end portion comprising a nipple extending in the longitudinal direction of the marine hose, the marine hose fluid leakage detection system further comprising: a passive IC tag provided 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, wherein the radio wave receiver is configured to receive radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, and presence of leakage of the fluid is configured to be detected when a strength of the radio waves transmitted from the IC tag is less than a reference value, the reference value being the strength of the radio waves transmitted by the IC tag and received by the radio wave receiver in a normal state in which the fluid does not leak from the flow path, wherein the IC tag is provided at least within a range to which the nipple extends, at an end portion in the longitudinal direction of the marine hose. the marine hose, wherein the marine hose comprises an inner reinforcing layer and an outer reinforcing layer laminated on an outer peripheral side of the flow path, a fluid retention layer interposed between the inner reinforcing layer and the outer reinforcing layer, a buoyant layer laminated on an outer peripheral side of the fluid retention layer and at least one connecting end portion comprising a nipple extending in the longitudinal direction of the marine hose, the marine hose fluid leakage detection system further comprising: a passive IC tag provided 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, wherein the radio wave receiver is configured to receive radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, and presence of leakage of the fluid is configured to be detected when a strength of the radio waves transmitted from the IC tag is less than a reference value, the reference value being the strength of the radio waves transmitted by the IC tag and received by the radio wave receiver in a normal state in which the fluid does not leak from the flow path, wherein the IC tag is provided at least within a range to which the nipple extends, at an end portion in the longitudinal direction of the marine hose. a passive IC tag provided 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, wherein the radio wave receiver is configured to receive radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, and presence of leakage of the fluid is configured to be detected when a strength of the radio waves transmitted from the IC tag is less than a reference value, the reference value being the strength of the radio waves transmitted by the IC tag and received by the radio wave receiver in a normal state in which the fluid does not leak from the flow path, the radio wave receiver is configured to receive radio waves transmitted from the IC tag in response to radio waves transmitted from the radio wave transmitter, and presence of leakage of the fluid is configured to be detected when a strength of the radio waves transmitted from the IC tag is less than a reference value, the reference value being the strength of the radio waves transmitted by the IC tag and received by the radio wave receiver in a normal state in which the fluid does not leak from the flow path, wherein the IC tag is provided at least within a range to which the nipple extends, at an end portion in the longitudinal direction of the marine hose.