Background: Carboplatin (CBDCA) hypersensitivity reactions (HSR) often occur in patients with ovarian cancer. Once CBACA HSR occurs, it is difficult to use platinum even though the patients had platinum-sensitive disease and consequently the survival of the patients cannot be prolonged. We had administered weekly paclitaxel and cisplatin (CDDP) chemotherapy (wTP) for patients with ovarian cancer who developed CBDCA HSR in previous chemotherapy. We investigated the safety and efficacy of wTP. Methods: We investigated 86 patients with ovarian, fallopian tube, and peritoneal carcinoma who developed CBDCA HSR in previous chemotherapy (paclitaxel/CBDCA) at our institution between 2011 and 2019. After premedication was administered, paclitaxel and sequentially CDDP were administered as one hour infusion, respectively (paclitaxel 80 mg/m², CDDP 25 mg/m²; 1, 8, 15 day/4 weeks). Results: The median cycle of the previous chemotherapy of CBDCA was 8 (interquartile range [IQR], 6–11). The grade of CBDCA HSR was 1 in 57 (66%), 2 in 26 (30%), and, 3 in 1 (1%) patient(s). WTP was administered for the first line in 21 (24%), second line in 35 (41%) and third or more line in 30 patients (34%). The median cycles of wTP administration was 4 (IQR, 3–7). We observed that severe CDDP HSR did not occur in any patients and 15 patients (17.4%, grade 1, 10 patients; grade 2, 5) developed CDDP HSR. All CDDP HSR were successfully managed with infusion interruption and Hydrocortisone Sodium Phosphate administration. There was no relation between the grade of CBDCA HSR in the previous chemotherapy and the rate of CDDP HSR (p = 0.363). Progression-free survival and overall survival after administration of wTP were 10.9 months (95% CI: 7.7–17.7) and 25.9 months (95%Ci: 19.0–50.2), respectively. Conclusions: 71 patients (82%) who developed CBDCA HSR in previous chemotherapy were able to continue administration of wTP without CDDP HSR. WTP was safe and effective for the patients who developed CBDCA HSR.