Transport system and transport method

A transport system configured to transport a receptacle which accommodates an upright sample holder containing a sample, comprising:

• a pair of screws arranged parallel to each other, each of the screws comprising a rotatable-shaft disposed along a predetermined transport path and a helical ridge protruding outward from an outer peripheral surface of the shaft, the ridge comprising a plurality of ridge portions being arranged along an axial direction in the outer peripheral surface of the shaft;
• a drive unit configured to rotate the screw;
• and
• the receptacle,
• wherein the receptacle comprises an inwardly recessed groove section on an outer peripheral surface thereof and flanges protruding outward from the groove section and located below and above, respectively, of the groove section,
• the groove section is sandwiched between the shafts of the pair of screws, and
• the lower and upper flanges are sandwiched between the ridge portions axially arranged on the pair of screws.