A segmented process apparatus (10, 100) for a microplate, comprising: a predetermined microplate (96, 108, 200) provided with a number of wells set in array; one or more nozzle heads (12, 156, 170, 184, 190, 223) provided with a number of nozzles (120, 144, 150) set in array; a suction and ejection mechanism for sucking and ejecting a gas via the nozzles; and a moving means which allows relative movement between said microplate and the nozzle heads (12, 156, 170, 184, 190, 223), wherein the tips (14, 124, 148, 154) of all of the nozzles provided on each nozzle head (12, 156, 170, 184, 190, 223) are provided in such a manner that the tips can be inserted into the wells in a part of said microplate all together, and the row intervals and column intervals of said nozzles (120, 144, 150) in array are respectively same as the row intervals and column intervals of said wells in array, and a magnetic force means is provided having a magnet provided in such a manner that the magnet is movable toward and away from said nozzles (120, 144, 150) along a straight line or a curve that passes in the vicinity of each of said nozzles without crossing either of said nozzles (120, 144, 150), so that it is possible to apply a magnetic field to and remove a magnetic field from inside each of the nozzles (120, 144, 150) provided on said nozzle head (12, 156, 170, 184, 190, 223) all together, for separation of magnetic particles through adsorption on the inner wall of the nozzles (120, 144, 150) and re-suspension of magnetic particles respectively, characterised in that the magnetic force means includes: one or more comb teeth members in rod form, which extend in the row direction or the column direction and which are correspondingly aligned in the column direction or the row direction so as to come adjacent to either one or two nozzle rows or nozzle columns; a support member connected to one or more of the comb teeth members at one end and movable relative to said nozzles; and magnets provided in each comb teeth member in locations corresponding to the nozzles belonging to said one or two nozzle rows or nozzle columns adjacent to the comb teeth member each other, and wherein at least one of the comb teeth members can be inserted between the rows of nozzles (120, 144, 150) or between the columns of nozzles (120, 144, 150). a predetermined microplate (96, 108, 200) provided with a number of wells set in array; one or more nozzle heads (12, 156, 170, 184, 190, 223) provided with a number of nozzles (120, 144, 150) set in array; a suction and ejection mechanism for sucking and ejecting a gas via the nozzles; and a moving means which allows relative movement between said microplate and the nozzle heads (12, 156, 170, 184, 190, 223), wherein the tips (14, 124, 148, 154) of all of the nozzles provided on each nozzle head (12, 156, 170, 184, 190, 223) are provided in such a manner that the tips can be inserted into the wells in a part of said microplate all together, and the row intervals and column intervals of said nozzles (120, 144, 150) in array are respectively same as the row intervals and column intervals of said wells in array, and a magnetic force means is provided having a magnet provided in such a manner that the magnet is movable toward and away from said nozzles (120, 144, 150) along a straight line or a curve that passes in the vicinity of each of said nozzles without crossing either of said nozzles (120, 144, 150), so that it is possible to apply a magnetic field to and remove a magnetic field from inside each of the nozzles (120, 144, 150) provided on said nozzle head (12, 156, 170, 184, 190, 223) all together, for separation of magnetic particles through adsorption on the inner wall of the nozzles (120, 144, 150) and re-suspension of magnetic particles respectively, characterised in that the magnetic force means includes: one or more comb teeth members in rod form, which extend in the row direction or the column direction and which are correspondingly aligned in the column direction or the row direction so as to come adjacent to either one or two nozzle rows or nozzle columns; a support member connected to one or more of the comb teeth members at one end and movable relative to said nozzles; and magnets provided in each comb teeth member in locations corresponding to the nozzles belonging to said one or two nozzle rows or nozzle columns adjacent to the comb teeth member each other, and wherein at least one of the comb teeth members can be inserted between the rows of nozzles (120, 144, 150) or between the columns of nozzles (120, 144, 150).