An in-pipe moving apparatus (1, 71, 101, 111): the in-pipe traveling apparatus (1, 71, 101, 111) comprises at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) arranged in series in a traveling direction; and at least two sets of joint sections (3A, 3B, 73A, 73B, 73C, 113A, 113B, 113C) that pivotably link the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) to each other, each of the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) includes a tire-integrated wheel, a drive section that drives and rotates the tire-integrated wheel, a first frame (26, 81, 83, 85) fixed to the drive section, characterized in that: at least one second frame (25, 82, 84, 86) pivotably attached to the drive section, a bending generator (44, 104, 114A, 114B) isprovided between one of the first frames (26, 81, 83, 85) and one of the second frames (25, 82, 84, 86) in the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) and imparts tension for causing the first frames (26, 81, 83, 85) and the second frames (25, 82, 84, 86) to have a V-like bent shape, and each of the two sets of joint sections (3A, 3B, 73A, 73B, 73C, 113A, 113B, 113C) is configured to be pivotable in a direction roughly perpendicular to the direction in which the second frames (25, 82, 84, 86) pivot. the in-pipe traveling apparatus (1, 71, 101, 111) comprises at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) arranged in series in a traveling direction; and at least two sets of joint sections (3A, 3B, 73A, 73B, 73C, 113A, 113B, 113C) that pivotably link the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) to each other, each of the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) includes a tire-integrated wheel, a drive section that drives and rotates the tire-integrated wheel, a first frame (26, 81, 83, 85) fixed to the drive section, at least one second frame (25, 82, 84, 86) pivotably attached to the drive section, a bending generator (44, 104, 114A, 114B) isprovided between one of the first frames (26, 81, 83, 85) and one of the second frames (25, 82, 84, 86) in the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) and imparts tension for causing the first frames (26, 81, 83, 85) and the second frames (25, 82, 84, 86) to have a V-like bent shape, and each of the two sets of joint sections (3A, 3B, 73A, 73B, 73C, 113A, 113B, 113C) is configured to be pivotable in a direction roughly perpendicular to the direction in which the second frames (25, 82, 84, 86) pivot. a bending generator (44, 104, 114A, 114B) isprovided between one of the first frames (26, 81, 83, 85) and one of the second frames (25, 82, 84, 86) in the at least three sets of tire-integrated wheel units (2A, 2B, 2C, 72A, 72B, 72C, 72D, 112A, 112B, 112C, 112D) and imparts tension for causing the first frames (26, 81, 83, 85) and the second frames (25, 82, 84, 86) to have a V-like bent shape, and each of the two sets of joint sections (3A, 3B, 73A, 73B, 73C, 113A, 113B, 113C) is configured to be pivotable in a direction roughly perpendicular to the direction in which the second frames (25, 82, 84, 86) pivot.