A conveyor belt take-up drum includes spacers of substantially the same length as the width of a conveyor belt being taken up onto a core section are detachably provided between opposing outer ends of main radial direction members of flange sections linked to circumferential direction members on which ground-contacting sections are provided, the bending rigidity near joints between the core section and inner ends of the opposing main radial direction members is set lower than the bending rigidity of the main bodies of the main radial direction members, and the conveyor belt taken up onto the core section is sandwiched between the main radial direction members, putting the main radial direction members, the spacers, and the conveyor belt into an integrated state.