Kashiwa was a regular player during his first year at
Kokushikan University. On 6 January 2014, Kashiwa was announced at Sanfreece Hiroshima on a permanent transfer. Kashiwa was part of the squad called up for the
2015 FIFA Club World Cup. After beating
TP Mazembe in the quarter finals, he described a close chance he has as being "the one who was the most scared. I thought it was going in (laughs).". In September 2019, Kashiwa won the 2019 Meiji Yasuda J.League KONAMI Monthly MVP Award for August 2019. On 2 January 2021, Kashiwa extended his contract for the 2022 season. Kashiwa was part of the Sanfreece team that won the
2022 J.League Cup. On 5 August 2023, Kashiwa made his 400th J League appearance against
Shonan Bellmare. On 30 December 2023, he extended his contract for the 2024 season. On 25 November 2024, the club announced that he would not be extending his contract for the 2025 season. In his final match for Sanfreece Hiroshima, he came on as a substitute in the 78th minute and assisted
Mutsuki Kato. On 28 December 2024, Kashiwa was announced at Ventforet Kofu on a permanent transfer, returning to the club after 12 years. ==Club statistics==