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The stainless steel 5-neck flask is a laboratory reaction vessel that allows for reaction evaluation in a material close to actual equipment while maintaining the operability of the commonly used 5-neck glass flask in laboratory tests. Since stainless steel reaction tanks are widely used in mass production facilities, there may be differences in reaction behavior, yield, and by-product generation trends between laboratory test results with glass flasks and actual results after scale-up. By using this product, it is possible to consider the influence of stainless steel material from the laboratory stage in reaction studies. With a multi-port structure that accommodates thermometers, coolers, dropwise addition, gas introduction, and stirring, it can be utilized for studies of atmospheric reflux reactions and monomer solution polymerization reactions, among others.