An automatic analyzer comprising: an analysis module including a sample dispensing mechanism for aspirating a sample from a sample container and discharging the aspirated sample into a reaction container, a reagent dispensing mechanism for aspirating a reagent from a reagent container and discharging the aspirated reagent into the reaction container, and a photometer for measuring the sample in the reaction container; first (101, 111) and second (104, 114; 102, 112) position adjustment switches that are disposed on a housing of the analysis module and are operable by an operator to adjust an operation position of either the sample dispensing mechanism or the reagent dispensing mechanism; wherein the first position adjustment switch (101, 111) enables the operator to manually adjust the operation position of the dispensing mechanism (4, 9); and a position adjustment controller adapted to drive the dispensing mechanism according to a position adjustment instruction from the first and second position adjustment switches, wherein the second position adjustment switch (104, 114) is configured as an interlocking releasing switch such that only in a state where the second position adjustment switch (104, 114) is pressed, the position adjustment controller allows the first position adjustment switch (101, 111) to adjust the operation position of the dispensing mechanism (4, 9) and drives the dispensing mechanism according (4, 9) to a position adjustment instruction from the first position adjustment switch, and in that the first position adjustment switch (102, 112) and the second position adjustment switch (104, 114) are disposed to be separated from each other by a distance at which the first position adjustment switch (102, 112) and the second position adjustment switch (104, 114) are not operable by a single hand of the operator at the same time. an analysis module including a sample dispensing mechanism for aspirating a sample from a sample container and discharging the aspirated sample into a reaction container, a reagent dispensing mechanism for aspirating a reagent from a reagent container and discharging the aspirated reagent into the reaction container, and a photometer for measuring the sample in the reaction container; first (101, 111) and second (104, 114; 102, 112) position adjustment switches that are disposed on a housing of the analysis module and are operable by an operator to adjust an operation position of either the sample dispensing mechanism or the reagent dispensing mechanism; wherein the first position adjustment switch (101, 111) enables the operator to manually adjust the operation position of the dispensing mechanism (4, 9); and a position adjustment controller adapted to drive the dispensing mechanism according to a position adjustment instruction from the first and second position adjustment switches, wherein the second position adjustment switch (104, 114) is configured as an interlocking releasing switch such that only in a state where the second position adjustment switch (104, 114) is pressed, the position adjustment controller allows the first position adjustment switch (101, 111) to adjust the operation position of the dispensing mechanism (4, 9) and drives the dispensing mechanism according (4, 9) to a position adjustment instruction from the first position adjustment switch, and in that the first position adjustment switch (102, 112) and the second position adjustment switch (104, 114) are disposed to be separated from each other by a distance at which the first position adjustment switch (102, 112) and the second position adjustment switch (104, 114) are not operable by a single hand of the operator at the same time.