A foreign substance removal system for vehicle for removing foreign substances by blowing fluid generated by a fluid supply source to each of a plurality of vehicle imaging devices attached to a vehicle body, wherein each of the vehicle imaging devices comprises: an outer casing comprising a housing having an opening and a translucent cover closing the opening; and a camera module disposed inside the outer casing, wherein a part of the translucent cover is provided as a transmission window through which image capturing light to be incident on the camera module is transmitted and to which the fluid is blown, wherein a fluid flowing part having a flow path of the fluid and connected to the fluid supply source is provided, wherein the fluid flowing part is branched into at least a first supply portion and a second supply portion, each having a respective flow path, and wherein the fluid supplied to the first supply portion is blown onto the transmission window of a first one of the vehicle imaging devices, and the fluid supplied to the second supply portion is blown onto the transmission window of a second one of the vehicle imaging devices, wherein the foreign substance removal system is configured to perform a one-sided injection control, in which fluid is supplied from the fluid supply source to the fluid flowing part in a state where the flow path of one of the first supply portion and the second supply portion is closed and the other is opened, characterised in that the foreign substance removal system is configured to perform the one-sided injection control to blow fluid on one of the transmission windows in response to determining that an adhesion amount of foreign substances on the one of the transmission windows is larger than an adhesion amount of foreign substances on the other of the transmission windows based on detection results of a sensor of the foreign substance removal system, wherein the sensor of the foreign substance removal system detects the state of captured images on displays or detects the state of the transmission windows. an outer casing comprising a housing having an opening and a translucent cover closing the opening; and a camera module disposed inside the outer casing, wherein a part of the translucent cover is provided as a transmission window through which image capturing light to be incident on the camera module is transmitted and to which the fluid is blown, wherein a fluid flowing part having a flow path of the fluid and connected to the fluid supply source is provided, wherein the fluid flowing part is branched into at least a first supply portion and a second supply portion, each having a respective flow path, and wherein the fluid supplied to the first supply portion is blown onto the transmission window of a first one of the vehicle imaging devices, and the fluid supplied to the second supply portion is blown onto the transmission window of a second one of the vehicle imaging devices, wherein the foreign substance removal system is configured to perform a one-sided injection control, in which fluid is supplied from the fluid supply source to the fluid flowing part in a state where the flow path of one of the first supply portion and the second supply portion is closed and the other is opened, characterised in that the foreign substance removal system is configured to perform the one-sided injection control to blow fluid on one of the transmission windows in response to determining that an adhesion amount of foreign substances on the one of the transmission windows is larger than an adhesion amount of foreign substances on the other of the transmission windows based on detection results of a sensor of the foreign substance removal system, wherein the sensor of the foreign substance removal system detects the state of captured images on displays or detects the state of the transmission windows.