A method of determining a falling state of a falling body passing through a measured substance inserted into a measuring container by using a falling speed measuring sensor including a first coil pair which includes a pair of coils disposed in the outer periphery of the measuring container and separated from each other in the vertical direction and a second coil pair which includes a pair of coils disposed in the outer periphery of the measuring container, separated from each other in the vertical direction, and disposed below the first coil pair so as to be separated therefrom by a specified distance, the method comprising: - measuring a first elapsed time (Ta) which is a time interval between extreme values (M1;M2) of two potentials generated in the first coil pair when the falling body passes through the first coil pair and - a second elapsed time (Tb) which is a time interval between extreme values (M3;M4) of two potentials generated in the second coil pair when the falling body passes through the second coil pair; and - determining the falling state of the falling body by comparing the first elapsed time (Ta) with the second elapsed time (Tb) or - determining the falling state of the falling body in a manner such that a falling speed which is obtained by dividing the vertical center distance of the first coil pair by the first elapsed time (Ta) is compared with a falling speed which is obtained by dividing the vertical center distance of the second coil pair by the second elapsed time (Tb), characterized in that, the method further comprises the following steps: - holding the falling body in a loading unit of a loading holder including a falling body holding mechanism which allows the falling body to be movable with respect to the loading unit by an extruding device while holding the falling body in the loading unit, whereby the falling of the falling body is suppressed by a frictional force which is generated between protrusions and the peripheral surface of the falling body, whereby the loading unit of the falling body holding mechanism includes a vertical hole and the protrusions formed in an inner peripheral surface of the vertical hole, and - the falling body loaded in a loading holder is sent into the measuring container attached to a lower portion of the extruding device by an extruding pin provided in the extruding device, whereby the extruding pin is movable in the vertical direction. - measuring a first elapsed time (Ta) which is a time interval between extreme values (M1;M2) of two potentials generated in the first coil pair when the falling body passes through the first coil pair and - a second elapsed time (Tb) which is a time interval between extreme values (M3;M4) of two potentials generated in the second coil pair when the falling body passes through the second coil pair; and - determining the falling state of the falling body by comparing the first elapsed time (Ta) with the second elapsed time (Tb) or - determining the falling state of the falling body in a manner such that a falling speed which is obtained by dividing the vertical center distance of the first coil pair by the first elapsed time (Ta) is compared with a falling speed which is obtained by dividing the vertical center distance of the second coil pair by the second elapsed time (Tb), - holding the falling body in a loading unit of a loading holder including a falling body holding mechanism which allows the falling body to be movable with respect to the loading unit by an extruding device while holding the falling body in the loading unit, whereby the falling of the falling body is suppressed by a frictional force which is generated between protrusions and the peripheral surface of the falling body, whereby the loading unit of the falling body holding mechanism includes a vertical hole and the protrusions formed in an inner peripheral surface of the vertical hole, and - the falling body loaded in a loading holder is sent into the measuring container attached to a lower portion of the extruding device by an extruding pin provided in the extruding device, whereby the extruding pin is movable in the vertical direction.