Japan competed as the host nation of the 2020 Summer Paralympics in their capital Tokyo from 24 August to 5 September 2021.
The following is the list of number of competitors participating in the Games:
Japan fielded nine archers (four men and five women) at the Games, as the host nation is automatically entitled to use the individual quota places.
Japan have secured three quotas in athletics after being in the top four of the 2019 World Para Athletics Marathon Championships and twelve more automatic qualification slots at the 2019 World Para Athletics Championships.
<small>* Nipada Saensupa from Thailand retired during the match between Ma Huihui from China, though the result doesn't count.</small>
Under goalball rules, as the host nation, Japan gets one of the ten slots for the men's, and women's, competitions. There are up to six athletes on the court at a time; three athletes per team are allowed on the court at one time.
Japan qualified two boats in the women's single sculls and mixed coxed four events for the games. Women's single sculls crews qualified by winning the gold medal at the 2021 FISA Asian & Oceanian Qualification Regatta in Tokyo, while mixed coxed four received the bipartite commission invitation allocation quotas.
<small>Qualification Legend: FA=Final A (medal); FB=Final B (non-medal); R=Repechage</small>
Five Japanese swimmers have qualified to compete in swimming at the 2020 Summer Paralympics via the 2019 World Para Swimming Championships slot allocation method.
Japan as host nation, entered five athletes into the table tennis competition at the games. Takashi Asano qualified from 2019 ITTF Asian Para Championships which was held in Taichung, Taiwan and four others via World Ranking allocation.
Japan as the host nation qualified three athletes to compete in three events at the Paralympics competition.
The women's sitting volleyball team finished in 10th place at the 2018 World ParaVolley Championships in the Netherlands but they hope to improve their volleyball skills before the home games.
Japan national wheelchair rugby team qualified for the Games automatically as the host nation quotas.
Japan qualified twelve players entries for wheelchair tennis. Shingo Kunieda and Yui Kamiji qualified by winning the gold medal at the 2018 Asian Para Games in Jakarta. Meanwhile ten other athletes qualified by world rankings.