A support and guide device, comprising: a plurality of track rails arranged in series so as to form a guide track; and a moving block (2, 2') movable along the guide track while being sequentially shifted between the plurality of track rails, wherein each of the plurality of track rails has a guide surface formed along a longitudinal direction of the each of the plurality of track rails, wherein the moving block (2, 2') comprises contact elements configured to travel on the guide surface of the each of the plurality of track rails, characterized in that i) each of the plurality of track rails has auxiliary sliding surfaces formed on both end portions of the each of the plurality of track rails in the longitudinal direction, the auxiliary sliding surfaces being formed side by side with the guide surface and being inclined with respect to the guide surface, and the moving block comprises leading sliding portions each being configured to face one of the auxiliary sliding surfaces of the each of the plurality of track rails when the moving block reaches one of both the end portions of the each of the plurality of track rails in the longitudinal direction, wherein the auxiliary sliding surface of a respective track rail is adapted to come into sliding contact with an opposed leading sliding portion of a respective moving block, when the moving block is displaced from the tracks rail at the time of moving across a joint between the track rails forming the guide track; or alternatively ii) the moving block has auxiliary sliding surfaces formed on both end portions of the moving block in the longitudinal direction, the auxiliary sliding surfaces being inclined with respect to the guide surface of the each of the plurality of track rails, and each of the plurality of track rails comprises leading sliding portions each being configured to face one of the auxiliary sliding surfaces of the moving block when the moving block reaches one of both the end portions of the each of the plurality of track rails in the longitudinal direction, wherein the auxiliary sliding surface of the respective moving block is adapted to come into sliding contact with an opposed leading sliding portion of a respective track rail, when the moving block is displaced from the track rails at the time of moving across a joint between the track rails forming the guide track. a plurality of track rails arranged in series so as to form a guide track; and a moving block (2, 2') movable along the guide track while being sequentially shifted between the plurality of track rails, wherein each of the plurality of track rails has a guide surface formed along a longitudinal direction of the each of the plurality of track rails, wherein the moving block (2, 2') comprises contact elements configured to travel on the guide surface of the each of the plurality of track rails, i) each of the plurality of track rails has auxiliary sliding surfaces formed on both end portions of the each of the plurality of track rails in the longitudinal direction, the auxiliary sliding surfaces being formed side by side with the guide surface and being inclined with respect to the guide surface, and the moving block comprises leading sliding portions each being configured to face one of the auxiliary sliding surfaces of the each of the plurality of track rails when the moving block reaches one of both the end portions of the each of the plurality of track rails in the longitudinal direction, wherein the auxiliary sliding surface of a respective track rail is adapted to come into sliding contact with an opposed leading sliding portion of a respective moving block, when the moving block is displaced from the tracks rail at the time of moving across a joint between the track rails forming the guide track; or alternatively the moving block comprises leading sliding portions each being configured to face one of the auxiliary sliding surfaces of the each of the plurality of track rails when the moving block reaches one of both the end portions of the each of the plurality of track rails in the longitudinal direction, wherein the auxiliary sliding surface of a respective track rail is adapted to come into sliding contact with an opposed leading sliding portion of a respective moving block, when the moving block is displaced from the tracks rail at the time of moving across a joint between the track rails forming the guide track; ii) the moving block has auxiliary sliding surfaces formed on both end portions of the moving block in the longitudinal direction, the auxiliary sliding surfaces being inclined with respect to the guide surface of the each of the plurality of track rails, and each of the plurality of track rails comprises leading sliding portions each being configured to face one of the auxiliary sliding surfaces of the moving block when the moving block reaches one of both the end portions of the each of the plurality of track rails in the longitudinal direction, wherein the auxiliary sliding surface of the respective moving block is adapted to come into sliding contact with an opposed leading sliding portion of a respective track rail, when the moving block is displaced from the track rails at the time of moving across a joint between the track rails forming the guide track.