An underwater mobile inspection apparatus capable of inspecting an inspection object on a seafloor while cruising, the underwater mobile inspection apparatus comprising: a cruising body configured to submerge under water; and a first movable arm provided on the cruising body ; characterized by that the cruising body configured to cruise along the inspection object in such a manner as not to come into contact with the inspection object ; the underwater mobile inspection apparatus comprising: an inspection tool unit for use in inspecting the inspection object , the inspection tool unit being provided on the first movable arm ; and a controller configured to, when the cruising body cruises along the inspection object in such a manner as not to come into contact with the inspection object , operate the first movable arm to move the inspection tool unit , such that a positional relationship of the inspection tool unit with the inspection object becomes a predetermined target positional relationship, wherein the inspection tool unit is provided with a running part configured to allow the inspection tool unit to run on the inspection object , and the controller operates the first movable arm by force feedback control, such that the inspection tool unit is in pressure contact with the inspection object with predetermined target pressing force. a cruising body configured to submerge under water; and a first movable arm provided on the cruising body ; characterized by that the cruising body configured to cruise along the inspection object in such a manner as not to come into contact with the inspection object ; the underwater mobile inspection apparatus comprising: an inspection tool unit for use in inspecting the inspection object , the inspection tool unit being provided on the first movable arm ; and a controller configured to, when the cruising body cruises along the inspection object in such a manner as not to come into contact with the inspection object , operate the first movable arm to move the inspection tool unit , such that a positional relationship of the inspection tool unit with the inspection object becomes a predetermined target positional relationship, wherein the inspection tool unit is provided with a running part configured to allow the inspection tool unit to run on the inspection object , and the controller operates the first movable arm by force feedback control, such that the inspection tool unit is in pressure contact with the inspection object with predetermined target pressing force. an inspection tool unit for use in inspecting the inspection object , the inspection tool unit being provided on the first movable arm ; and a controller configured to, when the cruising body cruises along the inspection object in such a manner as not to come into contact with the inspection object , operate the first movable arm to move the inspection tool unit , such that a positional relationship of the inspection tool unit with the inspection object becomes a predetermined target positional relationship, wherein the inspection tool unit is provided with a running part configured to allow the inspection tool unit to run on the inspection object , and the controller operates the first movable arm by force feedback control, such that the inspection tool unit is in pressure contact with the inspection object with predetermined target pressing force. <EOS>