PURPOSE:To provide a large-scale rover in which self-travel devices are fitted to a pressurization module of the maximum capacity so as not to become obstacles against a rocket housing chamber, and also whose structure is such that arms are fitted attachably/detachably to the pressurization module, and a self-travel device together with an arm can be exchanged and repaired. CONSTITUTION:Arms 2 which are formed so as to hold the belly portion of a pressurization module 1, are provided collapsably at both the front and rear sides of the pressurization module 1, and self-travel devices 3 are provided at these arms 2. Also, arms 2 are fitted through metal fittings 4 that are attachably/detachably fitted to module 1 side portions, and each of the metal fittings 4 possesses arm opening/closing mechanisms (9, 10, 11) whose purpose is to retain an arm 2 at an opening position and a closed position.
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