据日本广播协会电视台统计，4日，日本国内新增新冠肺炎确诊病例2595例；当天新增死亡病例86例。
3日，防疫专家在东京都疫情监测会议上警告称，目前东京都单日新增确诊病例数未呈明显下降趋势，且重症患者人数不见减少，疫情防控形势依然严峻。
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当天，日本防疫专家在会上表示，今后东京都的重症患者病例数有可能将继续增加，需高度警戒。东京都知事小池百合子也在记者会上表示，近来东京都无论昼夜，外出人流量都明显加大，对于疫情防控非常不利。
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东京都知事小池百合子：照这个趋势发展下去，有分析认为，估计很快疫情又会出现反弹。所有人彻底执行防疫措施很有必要，比如已经晚上8点了，大家都回家吧。
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此外，日本政府新冠肺炎疫情专家组组长尾身茂4日在国会发言时表示，为了将奥运会期间的疫情传播风险降到最低，比起限制运动员之间的接触与运动员和日本民众之间的接触，如何控制人员在全国范围内的流动更加重要。他要求东京奥组委和各级政府为此采取应对措施。