We statistically analysed on - orbit failures of medium and large satellite based upon primary analyses of satellite failures. Among failures of which sauces were identified, 20% is random failure, 50% is failure of design, and 30% is failure of manufacturing, respectively. For small satellite that were developed by universities, non of them with mass larger than 10kg have worked on orbit. Their reliability can be obtained only through technology improvements.%中大型衛星の軌道上での故障事象の一次分析結果に基いて，二次的な分析を行なった．原因のわかった故障のうち，部分の偶発故障は20％，設計不良は約50％，製造不良は約30％であった．一方，大学等が開発した超小型衛星については，10kg以上のもので軌道上で機能したものは現状時点ではなく，信頼性を向上させるための技術力の向上が必要である．
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