Most researchers, who are currently involved in the field of mass spectroscopy, think that the Mass Spectrometer is a "means" of accomplishing a research objective. In the 1950s when Prof. Matsuda started his research career, however, the mass spectrometer itself was the supreme "object" to be developed and established. He was confident that ion optics was a "means" to design and realize his objectives, and he devoted his early career in the development of the methodology of the 3rd-order ion optical calculations using the Matrix Method. With the establishment of the calculations, however, he found that the mass spectrometer itself turned into a "means." In the 1970s and 1980s, he used the ion optics he established in the innovative design of mass spectrometers. These accomplishments turned out to be a major contribution to the development of mass spec-trometry and to the formation of the society of mass spectroscopy. His method of ion optical calculations continues to be vital in designing beam transportation systems, as well as various types of spectrometers.%まず，はじめにお断りすべきであったことがある．質量分析の中興者であり，イオン光学の完成者である松田先生の研究人生の概観を，質量分析の世界から落ちこばれた私のような者が書くのは，本来，だいそれたことである．しかし，すこし遠くから，また斜めに見ていて，松田先生がイオン光学の完成に心血を注ぎ，質量分析の発展のために努力を惜しまず，物理を愛し続けられた姿はひしひしと伝わってきた．
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