Impact Factor（インパクトファクター）

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Impact Factor

2013/9/27

rev 2022/7/20

Impact Factor 1 Impact Factor 2 Impact Factor 3 Impact Factor 4 Impactfactor 5 EigenFactor 6 6

Impact Factor

Impact factor Eugene Gerfield 1996Impact factor Gerfield Thomson Clarivate Analytics Journal Citation Reports

Impact Factor

Impact factor

A(year) = (B(year1) + B(year2)) / (C(year1) + C(year2))

year A(year) B(year1) B(year2) C(year1) C(year2)

year Impact factor year year year year year year

2020 502019 40 2021 2



1

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2020 80 2019 60

2021 Impact Factor = (80 + 60) / (50 + 40) = 1.55

6 ImpactFactor 2022 ImpactFactor 2023 6

Impact Factor Impact Impact Factor Impact Factor

Impact Factor

Impact Factor Impact Factor 10

2021 1

2 3 4 5 6 7 8 9 10

Journal Title JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS PSYCHIATRY AND CLINICAL NEROSCIENCES NPG Asia Materials INFLAMMATATION AND REGENERATION BIOSCIENCE TREND SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS Gastric Cancer ALLEGOLOGY INTERNATIONALS Sustainability Science JOURNAL OF GASTROENTEROLOGY

Impact Factor 17.176

12.145 10.761 10.426 9.083 7.821 7.701 7.478 7.196 6.772

Clarivate Analytics Journal Citation Reports 2021



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2021 1 2 3 4 5 6 7 8 9 10

Journal Title CA-A CANCER JOURNAL FOR CLINICIANS LANCET NEW ENGLAND JOURNAL OF MEDICINE Journal of the American Medical Association NATURE REVIEWS MOLECULAR CELL BIOLOGY NATURE REVIEWS DRUG DISCOVERY NATURE REVIEWS INNUNOLOGY LANCET RESPIRATORY MEDICINE BMJ-BRITISH MEDICAL JOURNAL NATURE MEDICINE

Clarivate Analytics Journal Citation Reports 2021

Impact Factor 286.13 202.731 176.079 157.335 113.915 112.285 108.555 87.241 93.333 87.241

Impact Factor Impact Factor Impact Factor Impact Factor

Impact Factor

Journal Citation ReportsJCRJCR WEB WEB WEB JCR Impact Factor Impact Factor

JCR Clarivate Analytics JCR

Clarivate Analytics JCR JCR

Impact Factor



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Clarivate Analytics

Impact Factor

Impact Factor Clarivate Analytics Web Web of Science Web of Scienrce Science Citation Index ExpandedSCIE Social Scineces Citation IndexSSCI E SCI DVD Impact Factor SCIE SSCI

Web of ScienceSCIE SSCIClarivate Analytics

Clarivate Analytics 4

1 2 3 4

1 2

3 Regional Journal 20 ImpactFactor 21430 10 10 Editorial Board 2008 Regional Journal

Impact Factor Impact Factor Web of Science Web of Science Impact Factor Impact Factor ImpactFactor ImpactFactor



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ImpactFactor ImpactFactor

Clarivate Analytics Clarivate Analytics Clarivate Analytics 2

Impactfactor

Impact Factor Impact Factor

ImpactFactor Method Guideline

ImpactFactor ImpactFactor

Clarivate Analytics EigenFactor



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