Automatic analyzer and reaction vessel

An automatic analyzer that analyzes a mixture of a sample and a reagent contained in a reaction vessel, comprising:

• a heat block including a hole into which the reaction vessel is inserted and an urging member that urges the reaction vessel,
• wherein the reaction vessel includes a first protrusion on a part of a side surface,
• when the reaction vessel is lowered from an upper side to a lower side in a vertical direction as it is inserted into the hole, the urging member is operated so as to be retreated to an outside of the reaction vessel along the first protrusion, and also is installed so as to urge the first protrusion downward in the vertical direction when the reaction vessel is fitted in the hole, and
• the urging member is also operated in the vertical direction along the first protrusion when the reaction vessel is inserted, and includes a stopper so as not to be moved more than a certain amount of movement.

An automatic analyzer that analyzes a mixture of a sample and a reagent contained in a reaction vessel, comprising:

• a heat block including a hole into which the reaction vessel is inserted and an urging member that urges the reaction vessel,
• wherein the reaction vessel includes a first protrusion on a part of a side surface,
• when the reaction vessel is lowered from an upper side to a lower side in a vertical direction as it is inserted into the hole, the urging member is operated so as to be retreated to an outside of the reaction vessel along the first protrusion, and also is installed so as to urge the first protrusion downward in the vertical direction when the reaction vessel is fitted in the hole, and
• the urging member includes a stopper having an inclination so as to be guided to be fitted within a predetermined height in an absence of the reaction vessel, and, when the reaction vessel is inserted, to allow a vertical movement as it is retreated to the outside of the reaction vessel along the first protrusion.

A reaction vessel that contains a mixture of a sample and a reagent, comprising:

• on a part of a side surface thereof, a first protrusion for urging with a spring;
• and
• a second protrusion as a part of the side surface, for guiding a light-transmitting surface, which is provided at a position deviating on a vertical line from the first protrusion, to be vertical,
• wherein a lowermost surface of the first protrusion is provided on an upper side with respect to a liquid surface height at a maximum reaction solution amount in the reaction vessel.